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<h1>22. Virtuoso Functions Guide - regexp_match</h1>
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<div id="text">
<h2>regexp_match</h2>
<div class="refpurpose">returns a substring matching the regular expression to the supplied string</div>
<div class="funcsynopsis">
<span class="funcdef">varchar <span class="function">regexp_match</span>
</span>
(<span class="paramdef">in <span class="parameter">pattern</span> any</span>,
<span class="paramdef">inout <span class="parameter">str</span> any</span>,
<span class="paramdefoptional">[in <span class="optional">change_the_str</span> integer]</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
The regexp_match function returns a copy of substring of string
<span class="computeroutput">str</span> which matches the regular expression pattern.</p>
<p>Previous behavior of this function would cut the first characters of <span class="computeroutput">str</span>
until the end of regular expression matched substring. In this way
<span class="computeroutput">str</span> could be passed to this function again to find
the next occurrence of substring that matches the regular expression. By
default this behavior is not adopted by this function, but can be enabled for
pre 3.2 compatibility by supplying the optional third parameter.</p>
<p>If either the <span class="computeroutput">pattern</span> or <span class="computeroutput">str</span>
parameter contain wide characters this function will operate in wide mode,
first converting any narrow characters to wide and returning a wide character
response. Otherwise this function operates in narrow mode by default.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">pattern – </span>
The regular expression to match.</div>
<div class="refsect2">
<span class="refsect2title">str – </span>
The string to be searched. In compatibility mode (change_the_str =1)
this string in modified, removing the matched substring.</div>
<div class="refsect2">
<span class="refsect2title">change_the_str – </span>
This new parameter allows this function to operate in pre 3.2
compatibility mode which modified the original string. By default
this parameter is set to "0" so that the original string is never altered.</div>
</div>
<div class="refsect1">
<div class="refsect1title">Returns</div>
<p>This function returns the a substring matching the regular expression.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_regexp_match" />
<div class="example">
<div class="exampletitle">Examples</div>
<div>
<pre class="programlisting">
CREATE PROCEDURE all_tokens(IN pattern VARCHAR, IN str VARCHAR)
{
DECLARE wrd VARCHAR;
DECLARE ans VARCHAR;
DECLARE str_i VARCHAR;
ans:='';
str_i := str;
wrd := regexp_match(pattern,str_i);
WHILE (wrd IS NOT NULL)
{
ans := concat(ans,',',wrd);
wrd := regexp_match(pattern, str_i, 1);
};
RETURN ans;
};
</pre>
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<div class="refsect1title">See Also</div>
<p>
<a href="fn_regexp_parse.html">regexp_parse()</a>
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<a href="fn_regexp_like.html">regexp_like()</a>
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<a href="fn_regexp_instr.html">regexp_instr()</a>
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<a href="fn_regexp_replace.html">regexp_replace()</a>
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<a href="fn_regexp_substr.html">regexp_substr()</a>
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