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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_regex.ref.basic_regex"></a><a class="link" href="basic_regex.html" title="basic_regex"> basic_regex</a>
</h3></div></div></div>
<a name="boost_regex.ref.basic_regex.synopsis"></a><h5>
<a name="id1039806"></a>
<a class="link" href="basic_regex.html#boost_regex.ref.basic_regex.synopsis">Synopsis</a>
</h5>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
</pre>
<p>
The template class <code class="computeroutput"><span class="identifier">basic_regex</span></code>
encapsulates regular expression parsing and compilation. The class takes
two template parameters:
</p>
<div class="itemizedlist"><ul type="disc">
<li>
<code class="computeroutput"><span class="identifier">charT</span></code>: determines the
character type, i.e. either <code class="computeroutput"><span class="keyword">char</span></code>
or <code class="computeroutput"><span class="keyword">wchar_t</span></code>; see <a class="link" href="concepts/charT_concept.html" title="charT Requirements">charT
concept</a>.
</li>
<li>
<code class="computeroutput"><span class="identifier">traits</span></code>: determines the
behavior of the character type, for example which character class names
are recognized. A default traits class is provided: <code class="computeroutput"><span class="identifier">regex_traits</span><span class="special"><</span><span class="identifier">charT</span><span class="special">></span></code>. See also <a class="link" href="concepts/traits_concept.html" title="Traits Class Requirements">traits
concept</a>.
</li>
</ul></div>
<p>
For ease of use there are two typedefs that define the two standard <code class="computeroutput"><span class="identifier">basic_regex</span></code> instances, unless you want
to use custom traits classes or non-standard character types (for example
see <a class="link" href="non_std_strings/icu.html" title="Working With Unicode and ICU String Types">unicode support</a>),
you won't need to use anything other than these:
</p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span> <span class="special">=</span> <span class="identifier">regex_traits</span><span class="special"><</span><span class="identifier">charT</span><span class="special">></span> <span class="special">></span>
<span class="keyword">class</span> <span class="identifier">basic_regex</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">regex</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="keyword">wchar_t</span><span class="special">></span> <span class="identifier">wregex</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
The definition of <code class="computeroutput"><span class="identifier">basic_regex</span></code>
follows: it is based very closely on class <code class="computeroutput"><span class="identifier">basic_string</span></code>,
and fulfils the requirements for a constant-container of <code class="computeroutput"><span class="identifier">charT</span></code>.
</p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span><span class="special">{</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span> <span class="special">=</span> <span class="identifier">regex_traits</span><span class="special"><</span><span class="identifier">charT</span><span class="special">></span> <span class="special">></span>
<span class="keyword">class</span> <span class="identifier">basic_regex</span> <span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
<span class="comment">// types:
</span> <span class="keyword">typedef</span> <span class="identifier">charT</span> <span class="identifier">value_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">implementation</span><span class="special">-</span><span class="identifier">specific</span> <span class="identifier">const_iterator</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">const_iterator</span> <span class="identifier">iterator</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">charT</span><span class="special">&</span> <span class="identifier">reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">&</span> <span class="identifier">const_reference</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">ptrdiff_t</span> <span class="identifier">difference_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">size_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">flag_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">traits</span><span class="special">::</span><span class="identifier">locale_type</span> <span class="identifier">locale_type</span><span class="special">;</span>
<span class="comment">// constants:
</span> <span class="comment">// main option selection:
</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">normal</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">ECMAScript</span>
<span class="special">=</span> <span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">JavaScript</span>
<span class="special">=</span> <span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">JScript</span>
<span class="special">=</span> <span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">basic</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">basic</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">extended</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">extended</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">awk</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">awk</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">grep</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">grep</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">egrep</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">egrep</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">sed</span>
<span class="special">=</span> <span class="identifier">basic</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">sed</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">perl</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">literal</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">literal</span><span class="special">;</span>
<span class="comment">// modifiers specific to perl expressions:
</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_mod_m</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_mod_m</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_mod_s</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_mod_s</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">mod_s</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">mod_s</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">mod_x</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">mod_x</span><span class="special">;</span>
<span class="comment">// modifiers specific to POSIX basic expressions:
</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">bk_plus_qm</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">bk_plus_qm</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">bk_vbar</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">bk_vbar</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_char_classes</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_char_classes</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_intervals</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_intervals</span>
<span class="comment">// common modifiers:
</span> <span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">nosubs</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">nosubs</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">optimize</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">optimize</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">collate</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">collate</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">newline_alt</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">newline_alt</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_except</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">newline_alt</span><span class="special">;</span>
<span class="comment">// construct/copy/destroy:
</span> <span class="keyword">explicit</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.construct1">basic_regex</a> <span class="special">();</span>
<span class="keyword">explicit</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.construct2">basic_regex</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.construct3">basic_regex</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p1</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p2</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.construct4">basic_regex</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="identifier">len</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span><span class="special">);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.construct5">basic_regex</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">></span>
<span class="keyword">explicit</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.construct6">basic_regex</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">p</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">InputIterator</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.construct7">basic_regex</a><span class="special">(</span><span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<span class="special">~</span><span class="identifier">basic_regex</span><span class="special">();</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.opeq1">basic_regex& operator=</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.opeq2">basic_regex& operator=</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.opeq3">basic_regex& operator=</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">p</span><span class="special">);</span>
<span class="comment">// iterators:
</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.subexpression">std::pair<const_iterator, const_iterator> subexpression</a><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.begin">const_iterator begin</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.end">const_iterator end</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// capacity:
</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.size">size_type size</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.max_size">size_type max_size</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.empty">bool empty</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.mark_count">unsigned mark_count</a><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
<span class="comment">//
</span> <span class="comment">// modifiers:
</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.assign1">basic_regex& assign</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">that</span><span class="special">);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.assign2">basic_regex& assign</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.assign3">basic_regex& assign</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">len</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">string_traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.assign4">basic_regex& assign</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">string_traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">InputIterator</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.assign5">basic_regex& assign</a><span class="special">(</span><span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
<span class="comment">// const operations:
</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.flags">flag_type flags</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.status">int status</a><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.str">basic_string<charT> str</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.compare">int compare</a><span class="special">(</span><span class="identifier">basic_regex</span><span class="special">&)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// locale:
</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.imbue">locale_type imbue</a><span class="special">(</span><span class="identifier">locale_type</span> <span class="identifier">loc</span><span class="special">);</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.getloc">locale_type getloc</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
<span class="comment">// swap
</span> <a class="link" href="basic_regex.html#boost_regex.basic_regex.swap">void swap</a><span class="special">(</span><span class="identifier">basic_regex</span><span class="special">&)</span> <span class="keyword">throw</span><span class="special">();</span>
<span class="special">};</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_eq">bool operator ==</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_ne">bool operator !=</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_lt">bool operator <</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_le">bool operator <=</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_ge">bool operator >=</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_gt">bool operator ></a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">io_traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">re_traits</span><span class="special">></span>
<span class="identifier">basic_ostream</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">io_traits</span><span class="special">>&</span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_stream">operator <<</a> <span class="special">(</span><span class="identifier">basic_ostream</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">io_traits</span><span class="special">>&</span> <span class="identifier">os</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">re_traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<a class="link" href="basic_regex.html#boost_regex.basic_regex.op_swap">void swap</a><span class="special">(</span><span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e1</span><span class="special">,</span>
<span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">e2</span><span class="special">);</span>
<span class="keyword">typedef</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="keyword">char</span><span class="special">></span> <span class="identifier">regex</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="keyword">wchar_t</span><span class="special">></span> <span class="identifier">wregex</span><span class="special">;</span>
<span class="special">}</span> <span class="comment">// namespace boost
</span></pre>
<a name="boost_regex.ref.basic_regex.description"></a><h5>
<a name="id1044607"></a>
<a class="link" href="basic_regex.html#boost_regex.ref.basic_regex.description">Description</a>
</h5>
<p>
Class <code class="computeroutput"><span class="identifier">basic_regex</span></code> has the
following public members:
</p>
<pre class="programlisting"><span class="comment">// main option selection:
</span><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">normal</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">ECMAScript</span>
<span class="special">=</span> <span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">JavaScript</span>
<span class="special">=</span> <span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">JScript</span>
<span class="special">=</span> <span class="identifier">normal</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">basic</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">basic</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">extended</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">extended</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">awk</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">awk</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">grep</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">grep</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">egrep</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">egrep</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">sed</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">sed</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">perl</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">literal</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">literal</span><span class="special">;</span>
<span class="comment">// modifiers specific to perl expressions:
</span><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_mod_m</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_mod_m</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_mod_s</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_mod_s</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">mod_s</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">mod_s</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">mod_x</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">mod_x</span><span class="special">;</span>
<span class="comment">// modifiers specific to POSIX basic expressions:
</span><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">bk_plus_qm</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">bk_plus_qm</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">bk_vbar</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">bk_vbar</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_char_classes</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_char_classes</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">no_intervals</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">no_intervals</span>
<span class="comment">// common modifiers:
</span><span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">nosubs</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">nosubs</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">optimize</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">optimize</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">collate</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">collate</span><span class="special">;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">regex_constants</span><span class="special">::</span> <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> <span class="identifier">newline_alt</span>
<span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">newline_alt</span><span class="special">;</span>
</pre>
<p>
The meaning of these options is documented in the <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> section.
</p>
<p>
The static constant members are provided as synonyms for the constants declared
in namespace <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span></code>; for each constant of type
<a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a>
declared in namespace <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span></code>
then a constant with the same name, type and value is declared within the
scope of basic_regex.
</p>
<a name="boost_regex.basic_regex.construct1"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">();</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<code class="computeroutput"><span class="identifier">basic_regex</span></code>.
</p>
<div class="table">
<a name="id1047610"></a><p class="title"><b>Table 1. basic_regex default construction postconditions</b></p>
<div class="table-contents"><table class="table" summary="basic_regex default construction postconditions">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">true</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="number">0</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>()</span></code>
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.construct2"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: <span class="emphasis"><em>p</em></span> shall not
be a null pointer.
</p>
<p>
<span class="bold"><strong>Throws</strong></span>: <a class="link" href="bad_expression.html" title="bad_expression"><code class="computeroutput"><span class="identifier">bad_expression</span></code></a> if <span class="emphasis"><em>p</em></span>
is not a valid regular expression, unless the flag <code class="computeroutput"><span class="identifier">no_except</span></code>
is set in <span class="emphasis"><em>f</em></span>.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>;
the object's internal finite state machine is constructed from the regular
expression contained in the null-terminated string <span class="emphasis"><em>p</em></span>,
and interpreted according to the <a class="link" href="syntax_option_type.html" title="syntax_option_type">option
flags</a> specified in <span class="emphasis"><em>f</em></span>.
</p>
<div class="table">
<a name="id1047913"></a><p class="title"><b>Table 2. Postconditions for basic_regex construction</b></p>
<div class="table-contents"><table class="table" summary="Postconditions for basic_regex construction">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">false</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">char_traits</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>::</span><span class="identifier">length</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>(</span><span class="identifier">p</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>f</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">mark_count</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
The number of marked sub-expressions within the expression.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.construct3"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p1</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p2</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: <span class="emphasis"><em>p1</em></span> and <span class="emphasis"><em>p2</em></span>
are not null pointers, <code class="computeroutput"><span class="identifier">p1</span> <span class="special"><</span> <span class="identifier">p2</span></code>.
</p>
<p>
<span class="bold"><strong>Throws</strong></span>: bad_expression if [p1,p2) is not
a valid regular expression, unless the flag <code class="computeroutput"><span class="identifier">no_except</span></code>
is set in <span class="emphasis"><em>f</em></span>.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>;
the object's internal finite state machine is constructed from the regular
expression contained in the sequence of characters [p1,p2), and interpreted
according the <a class="link" href="syntax_option_type.html" title="syntax_option_type">option flags</a>
specified in <span class="emphasis"><em>f</em></span>.
</p>
<div class="table">
<a name="id1048333"></a><p class="title"><b>Table 3. Postconditions for basic_regex construction</b></p>
<div class="table-contents"><table class="table" summary="Postconditions for basic_regex construction">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">false</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">distance</span><span class="special">(</span><span class="identifier">p1</span><span class="special">,</span><span class="identifier">p2</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>(</span><span class="identifier">p1</span><span class="special">,</span><span class="identifier">p2</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>f</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">mark_count</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
The number of marked sub-expressions within the expression.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.construct4"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> <span class="identifier">size_type</span> <span class="identifier">len</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: <span class="emphasis"><em>p</em></span> shall not
be a null pointer, <code class="computeroutput"><span class="identifier">len</span> <span class="special"><</span>
<span class="identifier">max_size</span><span class="special">()</span></code>.
</p>
<p>
<span class="bold"><strong>Throws</strong></span>: <a class="link" href="bad_expression.html" title="bad_expression"><code class="computeroutput"><span class="identifier">bad_expression</span></code></a> if <span class="emphasis"><em>p</em></span>
is not a valid regular expression, unless the flag <code class="computeroutput"><span class="identifier">no_except</span></code>
is set in <span class="emphasis"><em>f</em></span>.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>;
the object's internal finite state machine is constructed from the regular
expression contained in the sequence of characters [p, p+len), and interpreted
according the option flags specified in <span class="emphasis"><em>f</em></span>.
</p>
<div class="table">
<a name="id1049294"></a><p class="title"><b>Table 4. Postconditions for basic_regex construction</b></p>
<div class="table-contents"><table class="table" summary="Postconditions for basic_regex construction">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">false</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>len</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>(</span><span class="identifier">p</span><span class="special">,</span>
<span class="identifier">len</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>f</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">mark_count</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
The number of marked sub-expressions within the expression.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.construct5"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">e</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>
as a copy of the object <span class="emphasis"><em>e</em></span>.
</p>
<a name="boost_regex.basic_regex.construct6"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">></span>
<span class="identifier">basic_regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Throws</strong></span>: <a class="link" href="bad_expression.html" title="bad_expression"><code class="computeroutput"><span class="identifier">bad_expression</span></code></a> if <span class="emphasis"><em>s</em></span>
is not a valid regular expression, unless the flag <code class="computeroutput"><span class="identifier">no_except</span></code>
is set in <span class="emphasis"><em>f</em></span>.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>;
the object's internal finite state machine is constructed from the regular
expression contained in the string <span class="emphasis"><em>s</em></span>, and interpreted
according to the <a class="link" href="syntax_option_type.html" title="syntax_option_type">option
flags</a> specified in <span class="emphasis"><em>f</em></span>.
</p>
<div class="table">
<a name="id1049778"></a><p class="title"><b>Table 5. Postconditions for basic_regex construction</b></p>
<div class="table-contents"><table class="table" summary="Postconditions for basic_regex construction">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">false</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">s</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>s</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>f</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">mark_count</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
The number of marked sub-expressions within the expression.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.construct7"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">ForwardIterator</span><span class="special">></span>
<span class="identifier">basic_regex</span><span class="special">(</span><span class="identifier">ForwardIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">ForwardIterator</span> <span class="identifier">last</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Throws</strong></span>: <a class="link" href="bad_expression.html" title="bad_expression"><code class="computeroutput"><span class="identifier">bad_expression</span></code></a> if the sequence [first,
last) is not a valid regular expression, unless the flag <code class="computeroutput"><span class="identifier">no_except</span></code>
is set in <span class="emphasis"><em>f</em></span>.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Constructs an object of class
<a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>;
the object's internal finite state machine is constructed from the regular
expression contained in the sequence of characters [first, last), and interpreted
according to the <a class="link" href="syntax_option_type.html" title="syntax_option_type">option
flags</a> specified in <span class="emphasis"><em>f</em></span>.
</p>
<div class="table">
<a name="id1050144"></a><p class="title"><b>Table 6. Postconditions for basic_regex construction</b></p>
<div class="table-contents"><table class="table" summary="Postconditions for basic_regex construction">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">false</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">distance</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">last</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">>(</span><span class="identifier">first</span><span class="special">,</span><span class="identifier">last</span><span class="special">)</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>f</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">mark_count</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
The number of marked sub-expressions within the expression.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.opeq1"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">e</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the result of <code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">e</span><span class="special">.</span><span class="identifier">str</span><span class="special">(),</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">flags</span><span class="special">())</span></code>.
</p>
<a name="boost_regex.basic_regex.opeq2"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: <span class="emphasis"><em>p</em></span> shall not
be a null pointer.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the result of <code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">ptr</span><span class="special">)</span></code>.
</p>
<a name="boost_regex.basic_regex.opeq3"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">ST</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">SA</span><span class="special">></span>
<span class="identifier">basic_regex</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">ST</span><span class="special">,</span> <span class="identifier">SA</span><span class="special">>&</span> <span class="identifier">p</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the result of <code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span></code>.
</p>
<a name="boost_regex.basic_regex.subexpression"></a><p>
</p>
<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">pair</span><span class="special"><</span><span class="identifier">const_iterator</span><span class="special">,</span> <span class="identifier">const_iterator</span><span class="special">></span> <span class="identifier">subexpression</span><span class="special">(</span><span class="identifier">size_type</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns a pair of iterators denoting
the location of marked subexpression <span class="emphasis"><em>n</em></span> within the original
regular expression string. The returned iterators are relative to <code class="computeroutput"><span class="identifier">begin</span><span class="special">()</span></code>
and <code class="computeroutput"><span class="identifier">end</span><span class="special">()</span></code>.
</p>
<p>
<span class="bold"><strong>Requires</strong></span>: The expression must have been
compiled with the <a class="link" href="syntax_option_type.html" title="syntax_option_type"><code class="computeroutput"><span class="identifier">syntax_option_type</span></code></a> save_subexpression_location
set. Argument <span class="emphasis"><em>n</em></span> must be in within the range <code class="computeroutput"><span class="number">1</span> <span class="special"><=</span> <span class="identifier">n</span>
<span class="special"><</span> <span class="identifier">mark_count</span><span class="special">()</span></code>.
</p>
<a name="boost_regex.basic_regex.begin"></a><p>
</p>
<pre class="programlisting"><span class="identifier">const_iterator</span> <span class="identifier">begin</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns a starting iterator to
a sequence of characters representing the regular expression.
</p>
<a name="boost_regex.basic_regex.end"></a><p>
</p>
<pre class="programlisting"><span class="identifier">const_iterator</span> <span class="identifier">end</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns termination iterator to
a sequence of characters representing the regular expression.
</p>
<a name="boost_regex.basic_regex.size"></a><p>
</p>
<pre class="programlisting"><span class="identifier">size_type</span> <span class="identifier">size</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the length of the sequence
of characters representing the regular expression.
</p>
<a name="boost_regex.basic_regex.max_size"></a><p>
</p>
<pre class="programlisting"><span class="identifier">size_type</span> <span class="identifier">max_size</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the maximum length of the
sequence of characters representing the regular expression.
</p>
<a name="boost_regex.basic_regex.empty"></a><p>
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns true if the object does
not contain a valid regular expression, otherwise false.
</p>
<a name="boost_regex.basic_regex.mark_count"></a><p>
</p>
<pre class="programlisting"><span class="keyword">unsigned</span> <span class="identifier">mark_count</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the number of marked sub-expressions
within the regular expresion.
</p>
<a name="boost_regex.basic_regex.assign1"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">assign</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">that</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <a class="link" href="basic_regex.html#boost_regex.basic_regex.assign4"><code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">that</span><span class="special">.</span><span class="identifier">str</span><span class="special">(),</span> <span class="identifier">that</span><span class="special">.</span><span class="identifier">flags</span><span class="special">())</span></code></a>.
</p>
<a name="boost_regex.basic_regex.assign2"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">assign</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <a class="link" href="basic_regex.html#boost_regex.basic_regex.assign4"><code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">string_type</span><span class="special">(</span><span class="identifier">ptr</span><span class="special">),</span> <span class="identifier">f</span><span class="special">)</span></code></a>.
</p>
<a name="boost_regex.basic_regex.assign3"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">assign</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">ptr</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">len</span><span class="special">,</span> <span class="identifier">flag_type</span> <span class="identifier">f</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <a class="link" href="basic_regex.html#boost_regex.basic_regex.assign4"><code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">string_type</span><span class="special">(</span><span class="identifier">ptr</span><span class="special">,</span> <span class="identifier">len</span><span class="special">),</span> <span class="identifier">f</span><span class="special">)</span></code></a>.
</p>
<a name="boost_regex.basic_regex.assign4"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">string_traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">></span>
<span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">assign</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">string_traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Throws</strong></span>: <a class="link" href="bad_expression.html" title="bad_expression"><code class="computeroutput"><span class="identifier">bad_expression</span></code></a> if <span class="emphasis"><em>s</em></span>
is not a valid regular expression, unless the flag <code class="computeroutput"><span class="identifier">no_except</span></code>
is set in <span class="emphasis"><em>f</em></span>.
</p>
<p>
<span class="bold"><strong>Returns</strong></span>: *this.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Assigns the regular expression
contained in the string <span class="emphasis"><em>s</em></span>, interpreted according the
<a class="link" href="syntax_option_type.html" title="syntax_option_type">option flags</a> specified
in <span class="emphasis"><em>f</em></span>.
</p>
<div class="table">
<a name="id1051667"></a><p class="title"><b>Table 7. Postconditions for basic_regex::assign</b></p>
<div class="table-contents"><table class="table" summary="Postconditions for basic_regex::assign">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Element
</p>
</th>
<th>
<p>
Value
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="keyword">false</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">s</span><span class="special">.</span><span class="identifier">size</span><span class="special">()</span></code>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">str</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>s</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
<span class="emphasis"><em>f</em></span>
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">mark_count</span><span class="special">()</span></code>
</p>
</td>
<td>
<p>
The number of marked sub-expressions within the expression.
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><a name="boost_regex.basic_regex.assign5"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">InputIterator</span><span class="special">></span>
<span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">assign</span><span class="special">(</span><span class="identifier">InputIterator</span> <span class="identifier">first</span><span class="special">,</span> <span class="identifier">InputIterator</span> <span class="identifier">last</span><span class="special">,</span>
<span class="identifier">flag_type</span> <span class="identifier">f</span> <span class="special">=</span> <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">normal</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Requires</strong></span>: The type <code class="computeroutput"><span class="identifier">InputIterator</span></code>
corresponds to the <a href="http://input_iterator" target="_top">Input Iterator requirements
(24.1.1)</a>.
</p>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <a class="link" href="basic_regex.html#boost_regex.basic_regex.assign4"><code class="computeroutput"><span class="identifier">assign</span><span class="special">(</span><span class="identifier">string_type</span><span class="special">(</span><span class="identifier">first</span><span class="special">,</span> <span class="identifier">last</span><span class="special">),</span> <span class="identifier">f</span><span class="special">)</span></code></a>.
</p>
<a name="boost_regex.basic_regex.flags"></a><p>
</p>
<pre class="programlisting"><span class="identifier">flag_type</span> <span class="identifier">flags</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns a copy of the <a class="link" href="syntax_option_type.html" title="syntax_option_type">regular
expression syntax flags</a> that were passed to the object's constructor,
or the last call to <code class="computeroutput"><span class="identifier">assign</span></code>.
</p>
<a name="boost_regex.basic_regex.status"></a><p>
</p>
<pre class="programlisting"><span class="keyword">int</span> <span class="identifier">status</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns zero if the expression
contains a valid regular expression, otherwise an error code. This member
function is retained for use in environments that cannot use exception handling.
</p>
<a name="boost_regex.basic_regex.str"></a><p>
</p>
<pre class="programlisting"><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">charT</span><span class="special">></span> <span class="identifier">str</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns a copy of the character
sequence passed to the object's constructor, or the last call to assign.
</p>
<a name="boost_regex.basic_regex.compare"></a><p>
</p>
<pre class="programlisting"><span class="keyword">int</span> <span class="identifier">compare</span><span class="special">(</span><span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">e</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">flags</span><span class="special">()</span></code> then returns <code class="computeroutput"><span class="identifier">str</span><span class="special">().</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">e</span><span class="special">.</span><span class="identifier">str</span><span class="special">())</span></code>,
otherwise returns <code class="computeroutput"><span class="identifier">flags</span><span class="special">()</span>
<span class="special">-</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">flags</span><span class="special">()</span></code>.
</p>
<a name="boost_regex.basic_regex.imbue"></a><p>
</p>
<pre class="programlisting"><span class="identifier">locale_type</span> <span class="identifier">imbue</span><span class="special">(</span><span class="identifier">locale_type</span> <span class="identifier">l</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the result of <code class="computeroutput"><span class="identifier">traits_inst</span><span class="special">.</span><span class="identifier">imbue</span><span class="special">(</span><span class="identifier">l</span><span class="special">)</span></code> where
<code class="computeroutput"><span class="identifier">traits_inst</span></code> is a (default
initialized) instance of the template parameter <code class="computeroutput"><span class="identifier">traits</span></code>
stored within the object. Calls to <code class="computeroutput"><span class="identifier">imbue</span></code>
invalidate any currently contained regular expression.
</p>
<p>
<span class="bold"><strong>Postcondition</strong></span>: <code class="computeroutput"><span class="identifier">empty</span><span class="special">()</span> <span class="special">==</span> <span class="keyword">true</span></code>.
</p>
<a name="boost_regex.basic_regex.getloc"></a><p>
</p>
<pre class="programlisting"><span class="identifier">locale_type</span> <span class="identifier">getloc</span><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns the result of <code class="computeroutput"><span class="identifier">traits_inst</span><span class="special">.</span><span class="identifier">getloc</span><span class="special">()</span></code>
where <code class="computeroutput"><span class="identifier">traits_inst</span></code> is a (default
initialized) instance of the template parameter traits stored within the
object.
</p>
<a name="boost_regex.basic_regex.swap"></a><p>
</p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">basic_regex</span><span class="special">&</span> <span class="identifier">e</span><span class="special">)</span> <span class="keyword">throw</span><span class="special">();</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Swaps the contents of the two regular
expressions.
</p>
<p>
<span class="bold"><strong>Postcondition</strong></span>: <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> contains the regular expression that
was in <span class="emphasis"><em>e</em></span>, <span class="emphasis"><em>e</em></span> contains the regular
expression that was in <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>.
</p>
<p>
<span class="bold"><strong>Complexity</strong></span>: constant time.
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
Comparisons between <a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a> objects are provided
on an experimental basis: please note that these are not present in the
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Technical
Report on C++ Library Extensions</a>, so use with care if you are writing
code that may need to be ported to other implementations of <a class="link" href="basic_regex.html" title="basic_regex"><code class="computeroutput"><span class="identifier">basic_regex</span></code></a>.
</p></td></tr>
</table></div>
<a name="boost_regex.basic_regex.op_eq"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">==</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span>
<span class="special">==</span> <span class="number">0</span></code>.
</p>
<a name="boost_regex.basic_regex.op_ne"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">!=</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span>
<span class="special">!=</span> <span class="number">0</span></code>.
</p>
<a name="boost_regex.basic_regex.op_lt"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special"><</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span>
<span class="special"><</span> <span class="number">0</span></code>.
</p>
<a name="boost_regex.basic_regex.op_le"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special"><=</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span>
<span class="special"><=</span> <span class="number">0</span></code>.
</p>
<a name="boost_regex.basic_regex.op_ge"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">>=</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span>
<span class="special">>=</span> <span class="number">0</span></code>.
</p>
<a name="boost_regex.basic_regex.op_gt"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">></span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">compare</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span>
<span class="special">></span> <span class="number">0</span></code>.
</p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
The basic_regex stream inserter is provided on an experimental basis, and
outputs the textual representation of the expression to the stream.
</p></td></tr>
</table></div>
<a name="boost_regex.basic_regex.op_stream"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">io_traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">re_traits</span><span class="special">></span>
<span class="identifier">basic_ostream</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">io_traits</span><span class="special">>&</span>
<span class="keyword">operator</span> <span class="special"><<</span> <span class="special">(</span><span class="identifier">basic_ostream</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">io_traits</span><span class="special">>&</span> <span class="identifier">os</span>
<span class="keyword">const</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">re_traits</span><span class="special">>&</span> <span class="identifier">e</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: Returns <code class="computeroutput"><span class="special">(</span><span class="identifier">os</span> <span class="special"><<</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">str</span><span class="special">())</span></code>.
</p>
<a name="boost_regex.basic_regex.op_swap"></a><p>
</p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">></span>
<span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">lhs</span><span class="special">,</span>
<span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">>&</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
<span class="bold"><strong>Effects</strong></span>: calls <code class="computeroutput"><span class="identifier">lhs</span><span class="special">.</span><span class="identifier">swap</span><span class="special">(</span><span class="identifier">rhs</span><span class="special">)</span></code>.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 1998 -2007 John Maddock<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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