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<tr class="t-nv-h1"><td colspan="5"> Classes</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/basic_regex.html" title="cpp/regex/basic regex"><span class="t-lines"><span>basic_regex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/sub_match.html" title="cpp/regex/sub match"><span class="t-lines"><span>sub_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/match_results.html" title="cpp/regex/match results"><span class="t-lines"><span>match_results</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Algorithms</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_match.html" title="cpp/regex/regex match"><span class="t-lines"><span>regex_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_search.html" title="cpp/regex/regex search"><span class="t-lines"><span>regex_search</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_replace.html" title="cpp/regex/regex replace"><span class="t-lines"><span>regex_replace</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Iterators</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_iterator.html" title="cpp/regex/regex iterator"><span class="t-lines"><span>regex_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_token_iterator.html" title="cpp/regex/regex token iterator"><span class="t-lines"><span>regex_token_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Exceptions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_error.html" title="cpp/regex/regex error"><span class="t-lines"><span>regex_error</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Traits</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/regex_traits.html" title="cpp/regex/regex traits"><span class="t-lines"><span>regex_traits</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Constants</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/syntax_option_type.html" title="cpp/regex/syntax option type"><span class="t-lines"><span>syntax_option_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/match_flag_type.html" title="cpp/regex/match flag type"><span class="t-lines"><span>match_flag_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/error_type.html" title="cpp/regex/error type"><span class="t-lines"><span>error_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Regex Grammar</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex/ecmascript.html" title="cpp/regex/ecmascript"><span class="t-lines"><span>Modified ECMAScript-262</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><regex></code> </div>
</td></tr>
</table>
<p>The regular expressions library provides a class that represents <a href="http://en.wikipedia.com/wiki/Regular_expression" class="extiw" title="enwiki:Regular expression">regular expressions</a>, which are a kind of mini-language used to perform pattern matching within strings. Almost all operations with regexes can be characterized by operating on several of the following objects:
</p>
<ul><li> <b>Target sequence</b>. The character sequence that is searched for a pattern. This may be a range specified by two iterators, a null-terminated character string or <span class="t-lc"><a href="string/basic_string.html" title="cpp/string/basic string">std::string</a></span>.
</li></ul>
<ul><li> <b>Pattern</b>. This is the regular expression itself. It determines what constitutes a match. It is an object of type <span class="t-lc"><a href="regex/basic_regex.html" title="cpp/regex/basic regex">std::basic_regex</a></span>, constructed from a string with special syntax. See <a href="regex/syntax_option_type.html" title="cpp/regex/syntax option type"> syntax_option_type</a> for the description of supported syntax variations.
</li></ul>
<ul><li> <b>Matched array</b>. The information about matches may be retrieved as an object of type <span class="t-lc"><a href="regex/match_results.html" title="cpp/regex/match results">std::match_results</a></span>.
</li></ul>
<ul><li> <b>Replacement string</b>. This is a string that determines how to replace the matches, see <a href="regex/match_flag_type.html" title="cpp/regex/match flag type"> match_flag_type</a> for the description of supported syntax variations.
</li></ul>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="regex.html#Main_classes"><span class="tocnumber">1</span> <span class="toctext">Main classes</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="regex.html#Algorithms"><span class="tocnumber">2</span> <span class="toctext">Algorithms</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="regex.html#Iterators"><span class="tocnumber">3</span> <span class="toctext">Iterators</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="regex.html#Exceptions"><span class="tocnumber">4</span> <span class="toctext">Exceptions</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="regex.html#Traits"><span class="tocnumber">5</span> <span class="toctext">Traits</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="regex.html#Constants"><span class="tocnumber">6</span> <span class="toctext">Constants</span></a></li>
<li class="toclevel-1 tocsection-7"><a href="regex.html#Example"><span class="tocnumber">7</span> <span class="toctext">Example</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=1" title="Edit section: Main classes">edit</a>]</span> <span class="mw-headline" id="Main_classes">Main classes</span></h3>
<p>These classes encapsulate a regular expression and the results of matching a regular expression within a target sequence of characters.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/basic_regex.html" title="cpp/regex/basic regex"> <span class="t-lines"><span>basic_regex</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> regular expression object <br /> <span class="t-mark">(class template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_basic_regex&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/sub_match.html" title="cpp/regex/sub match"> <span class="t-lines"><span>sub_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> identifies the sequence of characters matched by a sub-expression <br /> <span class="t-mark">(class template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_sub_match&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/match_results.html" title="cpp/regex/match results"> <span class="t-lines"><span>match_results</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> identifies one regular expression match, including all sub-expression matches <br /> <span class="t-mark">(class template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_match_results&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=2" title="Edit section: Algorithms">edit</a>]</span> <span class="mw-headline" id="Algorithms">Algorithms</span></h3>
<p>These functions are used to apply the regular expression encapsulated in a regex to a target sequence of characters.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_match.html" title="cpp/regex/regex match"> <span class="t-lines"><span>regex_match</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> attempts to match a regular expression to an entire character sequence <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_match&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_search.html" title="cpp/regex/regex search"> <span class="t-lines"><span>regex_search</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> attempts to match a regular expression to any part of a character sequence <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_search&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_replace.html" title="cpp/regex/regex replace"> <span class="t-lines"><span>regex_replace</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> replaces occurrences of a regular expression with formatted replacement text <br /> <span class="t-mark">(function template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_replace&action=edit">[edit]</a></span>
</td></tr>
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<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=3" title="Edit section: Iterators">edit</a>]</span> <span class="mw-headline" id="Iterators">Iterators</span></h3>
<p>The regex iterators are used to traverse the entire set of regular expression matches found within a sequence.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_iterator.html" title="cpp/regex/regex iterator"> <span class="t-lines"><span>regex_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> iterates through all regex matches within a character sequence <br /> <span class="t-mark">(class template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_iterator&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_token_iterator.html" title="cpp/regex/regex token iterator"> <span class="t-lines"><span>regex_token_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> iterates through the specified sub-expressions within all regex matches in a given string or through unmatched substrings <br /> <span class="t-mark">(class template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_token_iterator&action=edit">[edit]</a></span>
</td></tr>
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<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=4" title="Edit section: Exceptions">edit</a>]</span> <span class="mw-headline" id="Exceptions">Exceptions</span></h3>
<p>This class defines the type of objects thrown as exceptions to report errors from the regular expressions library.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_error.html" title="cpp/regex/regex error"> <span class="t-lines"><span>regex_error</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> reports errors generated by the regular expressions library <br /> <span class="t-mark">(class)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_error&action=edit">[edit]</a></span>
</td></tr>
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<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=5" title="Edit section: Traits">edit</a>]</span> <span class="mw-headline" id="Traits">Traits</span></h3>
<p>The regex traits class is used to encapsulate the localizable aspects of a regex.
</p>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/regex_traits.html" title="cpp/regex/regex traits"> <span class="t-lines"><span>regex_traits</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> provides metainformation about a character type, required by the regex library <br /> <span class="t-mark">(class template)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_regex_traits&action=edit">[edit]</a></span>
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<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=6" title="Edit section: Constants">edit</a>]</span> <span class="mw-headline" id="Constants">Constants</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in namespace <code>std::regex_constants</code> </div>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex/syntax_option_type.html" title="cpp/regex/syntax option type"> <span class="t-lines"><span>syntax_option_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> general options controlling regex behavior <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_syntax_option_type&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="regex/match_flag_type.html" title="cpp/regex/match flag type"> <span class="t-lines"><span>match_flag_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> options specific to matching <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_match_flag_type&action=edit">[edit]</a></span>
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<td> <div class="t-dsc-member-div"><div><a href="regex/error_type.html" title="cpp/regex/error type"> <span class="t-lines"><span>error_type</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div>
</td>
<td> describes different types of matching errors <br /> <span class="t-mark">(typedef)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/regex/dsc_error_type&action=edit">[edit]</a></span>
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<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex&action=edit&section=7" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include <iostream></span>
<span class="co2">#include <iterator></span>
<span class="co2">#include <string></span>
<span class="co2">#include <regex></span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="string/basic_string.html"><span class="kw1072">std::<span class="me2">string</span></span></a> s <span class="sy1">=</span> <span class="st0">"Some people, when confronted with a problem, think "</span>
<span class="st0">"<span class="es1">\"</span>I know, I'll use regular expressions.<span class="es1">\"</span> "</span>
<span class="st0">"Now they have two problems."</span><span class="sy4">;</span>
 
<a href="regex/basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a> self_regex<span class="br0">(</span><span class="st0">"REGULAR EXPRESSIONS"</span>,
<a href="regex/syntax_option_type.html"><span class="kw1756">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="sy3">|</span> <a href="regex/syntax_option_type.html"><span class="kw1752">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">icase</span></span></a><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span><a href="regex/regex_search.html"><span class="kw1737">std::<span class="me2">regex_search</span></span></a><span class="br0">(</span>s, self_regex<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
<a href="io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Text contains the phrase 'regular expressions'<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<a href="regex/basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a> word_regex<span class="br0">(</span><span class="st0">"(<span class="es1">\\</span>S+)"</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">auto</span> words_begin <span class="sy1">=</span>
<a href="regex/regex_iterator.html"><span class="kw1742">std::<span class="me2">sregex_iterator</span></span></a><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, word_regex<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">auto</span> words_end <span class="sy1">=</span> <a href="regex/regex_iterator.html"><span class="kw1742">std::<span class="me2">sregex_iterator</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
 
<a href="io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Found "</span>
<span class="sy1"><<</span> <a href="iterator/distance.html"><span class="kw578">std::<span class="me2">distance</span></span></a><span class="br0">(</span>words_begin, words_end<span class="br0">)</span>
<span class="sy1"><<</span> <span class="st0">" words<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
<span class="kw4">const</span> <span class="kw4">int</span> N <span class="sy1">=</span> <span class="nu0">6</span><span class="sy4">;</span>
<a href="io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"Words longer than "</span> <span class="sy1"><<</span> N <span class="sy1"><<</span> <span class="st0">" characters:<span class="es1">\n</span>"</span><span class="sy4">;</span>
<span class="kw1">for</span> <span class="br0">(</span><a href="regex/regex_iterator.html"><span class="kw1742">std::<span class="me2">sregex_iterator</span></span></a> i <span class="sy1">=</span> words_begin<span class="sy4">;</span> i <span class="sy3">!</span><span class="sy1">=</span> words_end<span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> <span class="br0">{</span>
<a href="regex/match_results.html"><span class="kw1734">std::<span class="me2">smatch</span></span></a> match <span class="sy1">=</span> <span class="sy2">*</span>i<span class="sy4">;</span>
<a href="string/basic_string.html"><span class="kw1072">std::<span class="me2">string</span></span></a> match_str <span class="sy1">=</span> match.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>match_str.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">></span> N<span class="br0">)</span> <span class="br0">{</span>
<a href="io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">" "</span> <span class="sy1"><<</span> match_str <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
 
<a href="regex/basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a> long_word_regex<span class="br0">(</span><span class="st0">"(<span class="es1">\\</span>w{7,})"</span><span class="br0">)</span><span class="sy4">;</span>
<a href="string/basic_string.html"><span class="kw1072">std::<span class="me2">string</span></span></a> new_s <span class="sy1">=</span> <a href="regex/regex_replace.html"><span class="kw1738">std::<span class="me2">regex_replace</span></span></a><span class="br0">(</span>s, long_word_regex, <span class="st0">"[$&]"</span><span class="br0">)</span><span class="sy4">;</span>
<a href="io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> new_s <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Text contains the phrase 'regular expressions'
Found 19 words
Words longer than 6 characters:
people,
confronted
problem,
regular
expressions."
problems.
Some people, when [confronted] with a [problem], think
"I know, I'll use [regular] [expressions]." Now they have two [problems].</pre></div></div>
</div>
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