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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>regex_token_iterator</span></span></strong></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_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_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="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="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="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="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 class="t-navbar-head"><strong class="selflink"><tt>std::regex_token_iterator</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> Member Functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex_token_iterator/regex_token_iterator.html" title="cpp/regex/regex token iterator/regex token iterator"><span class="t-lines"><span>regex_token_iterator::regex_token_iterator</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex_token_iterator/operator=.html" title="cpp/regex/regex token iterator/operator="><span class="t-lines"><span>regex_token_iterator::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Comparisons</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex_token_iterator/operator_cmp.html" title="cpp/regex/regex token iterator/operator cmp"><span class="t-lines"><span>regex_token_iterator::operator==</span><span>regex_token_iterator::operator!=</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Observers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex_token_iterator/operator*.html" title="cpp/regex/regex token iterator/operator*"><span class="t-lines"><span>regex_token_iterator::operator*</span><span>regex_token_iterator::operator-></span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Modifiers</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="regex_token_iterator/operator_arith.html" title="cpp/regex/regex token iterator/operator arith"><span class="t-lines"><span>regex_token_iterator::operator++</span><span>regex_token_iterator::operator++(int)</span></span></a></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/regex_token_iterator/navbar_content&action=edit">[edit]</a></span></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>Defined in header <code><a href="../header/regex.html" title="cpp/header/regex"><regex></a></code>
</div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><br />
<p>    <span class="kw1">class</span> BidirIt,<br />
    <span class="kw1">class</span> CharT <span class="sy1">=</span> <span class="kw1">typename</span> <a href="../iterator/iterator_traits.html"><span class="kw557">std::<span class="me2">iterator_traits</span></span></a><span class="sy1"><</span>BidirIt<span class="sy1">></span><span class="sy4">::</span><span class="me2">value_type</span>,<br />
    <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="regex_traits.html"><span class="kw1745">std::<span class="me2">regex_traits</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span><br />
</p>
<span class="sy1">></span> <span class="kw1">class</span> regex_token_iterator</span></div></td>
<td class="t-dcl-nopad"> </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><code>std::regex_token_iterator</code> is a read-only <a href="../concept/ForwardIterator.html" title="cpp/concept/ForwardIterator"><code>ForwardIterator</code></a> that accesses the individual sub-matches of every match of a regular expression within the underlying character sequence. It can also be used to access the parts of the sequence that were not matched by the given regular expression (e.g. as a tokenizer).
</p><p>On construction, it constructs an <span class="t-lc">std::regex_iterator</span> and on every increment it steps through the requested sub-matches from the current match_results, incrementing the underlying <code>regex_iterator</code> when incrementing away from the last submatch.
</p><p>The default-constructed <code>std::regex_token_iterator</code> is the end-of-sequence iterator. When a valid <code>std::regex_token_iterator</code> is incremented after reaching the last submatch of the last match, it becomes equal to the end-of-sequence iterator. Dereferencing or incrementing it further invokes undefined behavior.
</p><p>Just before becoming the end-of-sequence iterator, a <span class="t-lc">std::regex_token_iterator</span> may become a <i>suffix iterator</i>, if the index <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1</span></span></span> (non-matched fragment) appears in the list of the requested submatch indexes. Such iterator, if dereferenced, returns a match_results corresponding to the sequence of characters between the last match and the end of sequence.
</p><p>A typical implementation of <code>std::regex_token_iterator</code> holds the underlying <span class="t-lc">std::regex_iterator</span>, a container (e.g. <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../container/vector.html"><span class="kw1094">std::<span class="me2">vector</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span></span></span>) of the requested submatch indexes, the internal counter equal to the index of the submatch, a pointer to <span class="t-lc">std::sub_match</span>, pointing at the current submatch of the current match, and a <span class="t-lc">std::match_results</span> object containing the last non-matched character sequence (used in tokenizer mode).
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="regex_token_iterator.html#Type_requirements"><span class="tocnumber">1</span> <span class="toctext">Type requirements</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="regex_token_iterator.html#Specializations"><span class="tocnumber">2</span> <span class="toctext">Specializations</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="regex_token_iterator.html#Member_types"><span class="tocnumber">3</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="regex_token_iterator.html#Member_functions"><span class="tocnumber">4</span> <span class="toctext">Member functions</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="regex_token_iterator.html#Notes"><span class="tocnumber">5</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-1 tocsection-6"><a href="regex_token_iterator.html#Example"><span class="tocnumber">6</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/regex_token_iterator&action=edit&section=1" title="Edit section: Type requirements">edit</a>]</span> <span class="mw-headline" id="Type_requirements">Type requirements</span></h3>
<table class="t-par-begin">
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>BidirIt</code> must meet the requirements of <a href="../concept/BidirectionalIterator.html" title="cpp/concept/BidirectionalIterator"><code>BidirectionalIterator</code></a>.
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_token_iterator&action=edit&section=2" title="Edit section: Specializations">edit</a>]</span> <span class="mw-headline" id="Specializations">Specializations</span></h3>
<p>Several specializations for common character sequence types are defined:
</p>
<table class="t-dsc-begin">
<tr class="t-dsc-header">
<td colspan="2"> <div>Defined in header <code><regex></code> </div>
</td></tr>
<tr class="t-dsc-hitem">
<td> Type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <code>cregex_token_iterator</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_token_iterator<span class="sy1"><</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>wcregex_token_iterator</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_token_iterator<span class="sy1"><</span><span class="kw4">const</span> <span class="kw4">wchar_t</span><span class="sy2">*</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>sregex_token_iterator</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_token_iterator<span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">string</span><span class="sy4">::</span><span class="me2">const_iterator</span><span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>wsregex_token_iterator</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_token_iterator<span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">wstring</span><span class="sy4">::</span><span class="me2">const_iterator</span><span class="sy1">></span></span></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_token_iterator&action=edit&section=3" title="Edit section: Member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td> Member type
</td>
<td> Definition
</td></tr>
<tr class="t-dsc">
<td> <code>value_type</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="sub_match.html"><span class="kw1726">std::<span class="me2">sub_match</span></span></a><span class="sy1"><</span>BidirIt<span class="sy1">></span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>difference_type</code>
</td>
<td> <span class="t-lc">std::ptrdiff_t</span>
</td></tr>
<tr class="t-dsc">
<td> <code>pointer</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> value_type<span class="sy2">*</span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>reference</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> value_type<span class="sy3">&</span></span></span>
</td></tr>
<tr class="t-dsc">
<td> <code>iterator_category</code>
</td>
<td> <span class="t-lc">std::forward_iterator_tag</span>
</td></tr>
<tr class="t-dsc">
<td> <code>regex_type</code>
</td>
<td> <span class="t-c"><span class="mw-geshi cpp source-cpp">basic_regex<span class="sy1"><</span>CharT, Traits<span class="sy1">></span></span></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_token_iterator&action=edit&section=4" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="regex_token_iterator/regex_token_iterator.html" title="cpp/regex/regex token iterator/regex token iterator"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td> constructs a new <code>regex_token_iterator</code> <br /> <span class="t-mark">(public member function)</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/regex_token_iterator/dsc_constructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><span class="t-lines"><span>(destructor)</span></span></div><div><span class="t-lines"><span><span class="t-mark">(implicitly declared)</span></span></span></div></div>
</td>
<td> destructs a <code>regex_token_iterator</code>, including the cached value <br /> <span class="t-mark">(public member function)</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/regex_token_iterator/dsc_destructor&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex_token_iterator/operator=.html" title="cpp/regex/regex token iterator/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td> assigns contents <br /> <span class="t-mark">(public member function)</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/regex_token_iterator/dsc_operator%3D&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex_token_iterator/operator_cmp.html" title="cpp/regex/regex token iterator/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div></div>
</td>
<td> compares two <code>regex_token_iterator</code>s <br /> <span class="t-mark">(public member function)</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/regex_token_iterator/dsc_operator_cmp&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex_token_iterator/operator*.html" title="cpp/regex/regex token iterator/operator*"> <span class="t-lines"><span>operator*</span><span>operator-></span></span></a></div></div>
</td>
<td> accesses current submatch <br /> <span class="t-mark">(public member function)</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/regex_token_iterator/dsc_operator*&action=edit">[edit]</a></span>
</td></tr>
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><div><a href="regex_token_iterator/operator_arith.html" title="cpp/regex/regex token iterator/operator arith"> <span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span></span></a></div></div>
</td>
<td> advances the iterator to the next submatch <br /> <span class="t-mark">(public member function)</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/regex_token_iterator/dsc_operator_arith&action=edit">[edit]</a></span>
</td></tr>
</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_token_iterator&action=edit&section=5" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>It is the programmer's responsibility to ensure that the <span class="t-lc">std::basic_regex</span> object passed to the iterator's constructor outlives the iterator. Because the iterator stores a <span class="t-lc">std::regex_iterator</span> which stores a pointer to the regex, incrementing the iterator after the regex was destroyed results in undefined behavior.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/regex_token_iterator&action=edit&section=6" 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 <fstream></span>
<span class="co2">#include <iostream></span>
<span class="co2">#include <algorithm></span>
<span class="co2">#include <iterator></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> text <span class="sy1">=</span> <span class="st0">"Quick brown fox."</span><span class="sy4">;</span>
<span class="co1">// tokenization (non-matched fragments)</span>
<span class="co1">// Note that regex is matched only two times: when the third value is obtained</span>
<span class="co1">// the iterator is a suffix iterator.</span>
<a href="basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a> ws_re<span class="br0">(</span><span class="st0">"<span class="es1">\\</span>s+"</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// whitespace</span>
<a href="../algorithm/copy.html"><span class="kw1315">std::<span class="me2">copy</span></span></a><span class="br0">(</span> std<span class="sy4">::</span><span class="me2">sregex_token_iterator</span><span class="br0">(</span>text.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, text.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, ws_re, <span class="sy2">-</span><span class="nu0">1</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">sregex_token_iterator</span><span class="br0">(</span><span class="br0">)</span>,
<a href="../iterator/ostream_iterator.html"><span class="kw575">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1"><</span><a href="../string/basic_string.html"><span class="kw1072">std::<span class="me2">string</span></span></a><span class="sy1">></span><span class="br0">(</span><a href="../io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a>, <span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
 
<span class="co1">// iterating the first submatches</span>
<a href="../string/basic_string.html"><span class="kw1072">std::<span class="me2">string</span></span></a> html <span class="sy1">=</span> <span class="st0">"<p><a href=<span class="es1">\"</span>http://google.com<span class="es1">\"</span>>google</a> "</span>
<span class="st0">"< a HREF =<span class="es1">\"</span>http://cppreference.com<span class="es1">\"</span>>cppreference</a><span class="es1">\n</span></p>"</span><span class="sy4">;</span>
<a href="basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a> url_re<span class="br0">(</span><span class="st0">"<<span class="es1">\\</span>s*A<span class="es1">\\</span>s+[^>]*href<span class="es1">\\</span>s*=<span class="es1">\\</span>s*<span class="es1">\"</span>([^<span class="es1">\"</span>]*)<span class="es1">\"</span>"</span>, std<span class="sy4">::</span><span class="me2">regex</span><span class="sy4">::</span><span class="me2">icase</span><span class="br0">)</span><span class="sy4">;</span>
<a href="../algorithm/copy.html"><span class="kw1315">std::<span class="me2">copy</span></span></a><span class="br0">(</span> std<span class="sy4">::</span><span class="me2">sregex_token_iterator</span><span class="br0">(</span>html.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, html.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, url_re, <span class="nu0">1</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">sregex_token_iterator</span><span class="br0">(</span><span class="br0">)</span>,
<a href="../iterator/ostream_iterator.html"><span class="kw575">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1"><</span><a href="../string/basic_string.html"><span class="kw1072">std::<span class="me2">string</span></span></a><span class="sy1">></span><span class="br0">(</span><a href="../io/cout.html"><span class="kw1481">std::<span class="me2">cout</span></span></a>, <span class="st0">"<span class="es1">\n</span>"</span><span class="br0">)</span><span class="br0">)</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">Quick
brown
fox.
http://google.com
http://cppreference.com</pre></div></div>
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