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<td >Qt 5.9</td><td ><a href="qtgui-index.html">Qt GUI</a></td><td ><a href="qtgui-module.html">C++ Classes</a></td><td >QRegularExpressionValidator</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#properties">Properties</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#reimplemented-public-functions">Reimplemented Public Functions</a></li>
<li class="level1"><a href="#public-slots">Public Slots</a></li>
<li class="level1"><a href="#signals">Signals</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
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<h1 class="title">QRegularExpressionValidator Class</h1>
<!-- $$$QRegularExpressionValidator-brief -->
<p>The <a href="qregularexpressionvalidator.html">QRegularExpressionValidator</a> class is used to check a string against a regular expression. <a href="#details">More...</a></p>
<!-- @@@QRegularExpressionValidator -->
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<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> <span class="preprocessor">#include <QRegularExpressionValidator></span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += gui</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 5.1</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="qvalidator.html">QValidator</a></td></tr></table></div><ul>
<li><a href="qregularexpressionvalidator-members.html">List of all members, including inherited members</a></li>
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<a name="properties"></a>
<h2 id="properties">Properties</h2>
<ul>
<li class="fn"><b><a href="qregularexpressionvalidator.html#regularExpression-prop">regularExpression</a></b> : QRegularExpression</li>
</ul>
<ul>
<li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</a></li>
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<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#QRegularExpressionValidator">QRegularExpressionValidator</a></b>(QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#QRegularExpressionValidator-1">QRegularExpressionValidator</a></b>(const QRegularExpression &<i>re</i>, QObject *<i>parent</i> = Q_NULLPTR)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#dtor.QRegularExpressionValidator">~QRegularExpressionValidator</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QRegularExpression </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#regularExpression-prop">regularExpression</a></b>() const</td></tr>
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<a name="reimplemented-public-functions"></a>
<h2 id="reimplemented-public-functions">Reimplemented Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> virtual QValidator::State </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#validate">validate</a></b>(QString &<i>input</i>, int &<i>pos</i>) const</td></tr>
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<ul>
<li class="fn">4 public functions inherited from <a href="qvalidator.html#public-functions">QValidator</a></li>
<li class="fn">32 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
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<a name="public-slots"></a>
<h2 id="public-slots">Public Slots</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#regularExpression-prop">setRegularExpression</a></b>(const QRegularExpression &<i>re</i>)</td></tr>
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<ul>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
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<a name="signals"></a>
<h2 id="signals">Signals</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> void </td><td class="memItemRight bottomAlign"><b><a href="qregularexpressionvalidator.html#regularExpression-prop">regularExpressionChanged</a></b>(const QRegularExpression &<i>re</i>)</td></tr>
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<ul>
<li class="fn">1 signal inherited from <a href="qvalidator.html#signals">QValidator</a></li>
<li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 public variable inherited from <a href="../qtcore/qobject.html#public-variables">QObject</a></li>
<li class="fn">10 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
<li class="fn">2 protected variables inherited from <a href="../qtcore/qobject.html#protected-variables">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QRegularExpressionValidator-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qregularexpressionvalidator.html">QRegularExpressionValidator</a> class is used to check a string against a regular expression.</p>
<p><a href="qregularexpressionvalidator.html">QRegularExpressionValidator</a> uses a regular expression (regexp) to determine whether an input string is <a href="qvalidator.html#State-enum">Acceptable</a>, <a href="qvalidator.html#State-enum">Intermediate</a>, or <a href="qvalidator.html#State-enum">Invalid</a>. The regexp can either be supplied when the <a href="qregularexpressionvalidator.html">QRegularExpressionValidator</a> is constructed, or at a later time.</p>
<p>If the regexp partially matches against the string, the result is considered <a href="qvalidator.html#State-enum">Intermediate</a>. For example, "" and "A" are <a href="qvalidator.html#State-enum">Intermediate</a> for the regexp <b>[A-Z][0-9]</b> (whereas "_" would be <a href="qvalidator.html#State-enum">Invalid</a>).</p>
<p><a href="qregularexpressionvalidator.html">QRegularExpressionValidator</a> automatically wraps the regular expression in the <code>\\A</code> and <code>\\z</code> anchors; in other words, it always attempts to do an exact match.</p>
<p>Example of use:</p>
<pre class="cpp">
<span class="comment">// regexp: optional '-' followed by between 1 and 3 digits</span>
<span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span> rx(<span class="string">"-?\\d{1,3}"</span>);
<span class="type"><a href="qvalidator.html#QValidator">QValidator</a></span> <span class="operator">*</span>validator <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qregularexpressionvalidator.html#QRegularExpressionValidator">QRegularExpressionValidator</a></span>(rx<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>edit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtwidgets/qlineedit.html">QLineEdit</a></span>(<span class="keyword">this</span>);
edit<span class="operator">-</span><span class="operator">></span>setValidator(validator);
</pre>
<p>Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.</p>
<pre class="cpp">
<span class="comment">// integers 1 to 9999</span>
<span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span> re(<span class="string">"[1-9]\\d{0,3}"</span>);
<span class="comment">// the validator treats the regexp as "^[1-9]\\d{0,3}$"</span>
<span class="type"><a href="qregularexpressionvalidator.html#QRegularExpressionValidator">QRegularExpressionValidator</a></span> v(re<span class="operator">,</span> <span class="number">0</span>);
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> s;
<span class="type">int</span> pos <span class="operator">=</span> <span class="number">0</span>;
s <span class="operator">=</span> <span class="string">"0"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
s <span class="operator">=</span> <span class="string">"12345"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// returns Invalid</span>
s <span class="operator">=</span> <span class="string">"1"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// returns Acceptable</span>
re<span class="operator">.</span>setPattern(<span class="string">"\\S+"</span>); <span class="comment">// one or more non-whitespace characters</span>
v<span class="operator">.</span>setRegularExpression(re);
s <span class="operator">=</span> <span class="string">"myfile.txt"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Acceptable</span>
s <span class="operator">=</span> <span class="string">"my file.txt"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Invalid</span>
<span class="comment">// A, B or C followed by exactly five digits followed by W, X, Y or Z</span>
re<span class="operator">.</span>setPattern(<span class="string">"[A-C]\\d{5}[W-Z]"</span>);
v<span class="operator">.</span>setRegularExpression(re);
s <span class="operator">=</span> <span class="string">"a12345Z"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Invalid</span>
s <span class="operator">=</span> <span class="string">"A12345Z"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Acceptable</span>
s <span class="operator">=</span> <span class="string">"B12"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Intermediate</span>
<span class="comment">// match most 'readme' files</span>
re<span class="operator">.</span>setPattern(<span class="string">"read\\S?me(\.(txt|asc|1st))?"</span>);
re<span class="operator">.</span>setPatternOptions(<span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span><span class="operator">::</span>CaseInsensitiveOption);
v<span class="operator">.</span>setRegularExpression(re);
s <span class="operator">=</span> <span class="string">"readme"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Acceptable</span>
s <span class="operator">=</span> <span class="string">"README.1ST"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Acceptable</span>
s <span class="operator">=</span> <span class="string">"read me.txt"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Invalid</span>
s <span class="operator">=</span> <span class="string">"readm"</span>; v<span class="operator">.</span>validate(s<span class="operator">,</span> pos); <span class="comment">// Returns Intermediate</span>
</pre>
</div>
<p><b>See also </b><a href="../qtcore/qregularexpression.html">QRegularExpression</a>, <a href="qintvalidator.html">QIntValidator</a>, <a href="qdoublevalidator.html">QDoubleValidator</a>, and <a href="qregexpvalidator.html">QRegExpValidator</a>.</p>
<!-- @@@QRegularExpressionValidator -->
<div class="prop">
<h2>Property Documentation</h2>
<!-- $$$regularExpression-prop$$$regularExpression$$$setRegularExpressionconstQRegularExpression&$$$regularExpressionChangedconstQRegularExpression& -->
<h3 class="fn" id="regularExpression-prop"><a name="regularExpression-prop"></a><span class="name">regularExpression</span> : <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span></h3>
<p>This property holds the regular expression used for validation</p>
<p>By default, this property contains a regular expression with an empty pattern (which therefore matches any string).</p>
<p><b>Access functions:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> QRegularExpression </td><td class="memItemRight bottomAlign"><span class="name"><b>regularExpression</b></span>() const</td></tr>
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>setRegularExpression</b></span>(const QRegularExpression &<i>re</i>)</td></tr>
</table></div>
<p><b>Notifier signal:</b></p>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft topAlign rightAlign"> void </td><td class="memItemRight bottomAlign"><span class="name"><b>regularExpressionChanged</b></span>(const QRegularExpression &<i>re</i>)</td></tr>
</table></div>
<!-- @@@regularExpression -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QRegularExpressionValidator[overload1]$$$QRegularExpressionValidatorQObject* -->
<h3 class="fn" id="QRegularExpressionValidator"><a name="QRegularExpressionValidator"></a>QRegularExpressionValidator::<span class="name">QRegularExpressionValidator</span>(<span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs a validator with a <i>parent</i> object that accepts any string (including an empty one) as valid.</p>
<!-- @@@QRegularExpressionValidator -->
<!-- $$$QRegularExpressionValidator$$$QRegularExpressionValidatorconstQRegularExpression&QObject* -->
<h3 class="fn" id="QRegularExpressionValidator-1"><a name="QRegularExpressionValidator-1"></a>QRegularExpressionValidator::<span class="name">QRegularExpressionValidator</span>(const <span class="type"><a href="../qtcore/qregularexpression.html">QRegularExpression</a></span> &<i>re</i>, <span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = Q_NULLPTR)</h3>
<p>Constructs a validator with a <i>parent</i> object that accepts all strings that match the regular expression <i>re</i>.</p>
<!-- @@@QRegularExpressionValidator -->
<!-- $$$~QRegularExpressionValidator[overload1]$$$~QRegularExpressionValidator -->
<h3 class="fn" id="dtor.QRegularExpressionValidator"><a name="dtor.QRegularExpressionValidator"></a>QRegularExpressionValidator::<span class="name">~QRegularExpressionValidator</span>()</h3>
<p>Destroys the validator.</p>
<!-- @@@~QRegularExpressionValidator -->
<!-- $$$validate[overload1]$$$validateQString&int& -->
<h3 class="fn" id="validate"><a name="validate"></a><code>[virtual] </code><span class="type"><a href="qvalidator.html#State-enum">QValidator::State</a></span> QRegularExpressionValidator::<span class="name">validate</span>(<span class="type"><a href="../qtcore/qstring.html">QString</a></span> &<i>input</i>, <span class="type">int</span> &<i>pos</i>) const</h3>
<p>Reimplemented from <a href="qvalidator.html#validate">QValidator::validate</a>().</p>
<p>Returns <a href="qvalidator.html#State-enum">Acceptable</a> if <i>input</i> is matched by the regular expression for this validator, <a href="qvalidator.html#State-enum">Intermediate</a> if it has matched partially (i.e. could be a valid match if additional valid characters are added), and <a href="qvalidator.html#State-enum">Invalid</a> if <i>input</i> is not matched.</p>
<p>In case the <i>input</i> is not matched, the <i>pos</i> parameter is set to the length of the <i>input</i> parameter; otherwise, it is not modified.</p>
<p>For example, if the regular expression is <b>\w\d\d</b> (word-character, digit, digit) then "A57" is <a href="qvalidator.html#State-enum">Acceptable</a>, "E5" is <a href="qvalidator.html#State-enum">Intermediate</a>, and "+9" is <a href="qvalidator.html#State-enum">Invalid</a>.</p>
<p><b>See also </b><a href="../qtcore/qregularexpression.html#match">QRegularExpression::match</a>().</p>
<!-- @@@validate -->
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