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<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"><a href="../basic_regex.html" title="cpp/regex/basic regex"><tt>std::basic_regex</tt></a><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="basic_regex.html" title="cpp/regex/basic regex/basic regex"><span class="t-lines"><span>basic_regex::basic_regex</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~basic_regex.html" title="cpp/regex/basic regex/~basic regex"><span class="t-lines"><span>basic_regex::~basic_regex</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator=.html" title="cpp/regex/basic regex/operator="><span class="t-lines"><span>basic_regex::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="assign.html" title="cpp/regex/basic regex/assign"><span class="t-lines"><span>basic_regex::assign</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="mark_count.html" title="cpp/regex/basic regex/mark count"><span class="t-lines"><span>basic_regex::mark_count</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="flags.html" title="cpp/regex/basic regex/flags"><span class="t-lines"><span>basic_regex::flags</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Locale</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="getloc.html" title="cpp/regex/basic regex/getloc"><span class="t-lines"><span>basic_regex::getloc</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="imbue.html" title="cpp/regex/basic regex/imbue"><span class="t-lines"><span>basic_regex::imbue</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="swap.html" title="cpp/regex/basic regex/swap"><span class="t-lines"><span>basic_regex::swap</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Constants</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>basic_regex constants</span></span></strong></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> Non-member Functions</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap2.html" title="cpp/regex/basic regex/swap2"><span class="t-lines"><span>swap<span class="t-dsc-small">(std::basic_regex)</span></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/basic_regex/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">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> icase <span class="sy1">=</span><br />
<p>    <a href="../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="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> nosubs <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1753">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">nosubs</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> optimize <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1754">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">optimize</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> collate <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1755">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">collate</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> ECMAScript <span class="sy1">=</span><br />
    <a href="../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="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> basic <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1757">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">basic</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> extended <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1758">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">extended</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> awk <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1759">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">awk</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> grep <span class="sy1">=</span><br />
    <a href="../syntax_option_type.html"><span class="kw1760">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">grep</span></span></a><span class="sy4">;</span><br />
<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="../syntax_option_type.html"><span class="kw1751">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> egrep <span class="sy1">=</span><br />
</p>
    <a href="../syntax_option_type.html"><span class="kw1761">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">egrep</span></span></a><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad"> </td>
<td class="t-dcl-nopad"> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><span class="t-lc">std::basic_regex</span> defines several constants that govern general regex matching syntax.
</p><p>These constants are duplicated from <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">regex_constants</span></span></span>:
</p>
<table class="t-dsc-begin">
<tr class="t-dsc-hitem">
<td> Value
</td>
<td> Effect(s)
</td></tr>
<tr class="t-dsc">
<td> <code>icase</code>
</td>
<td> Character matching should be performed without regard to case.
</td></tr>
<tr class="t-dsc">
<td> <code>nosubs</code>
</td>
<td> When performing matches, all marked sub-expressions <code><b>(<span class="t-spar">expr</span>)</b></code> are treated as non-marking sub-expressions <code><b>(?:<span class="t-spar">expr</span>)</b></code>. No matches are stored in the supplied <span class="t-lc">std::regex_match</span> structure and <code>mark_count()</code> is zero
</td></tr>
<tr class="t-dsc">
<td> <code>optimize</code>
</td>
<td> Instructs the regular expression engine to make matching faster, with the potential cost of making construction slower. For example, this might mean converting a non-deterministic FSA to a deterministic FSA.
</td></tr>
<tr class="t-dsc">
<td> <code>collate</code>
</td>
<td> Character ranges of the form <i>"[a-b]"</i> will be locale sensitive.
</td></tr>
<tr class="t-dsc">
<td> <code>ECMAScript</code>
</td>
<td> Use the <a href="../ecmascript.html" title="cpp/regex/ecmascript">Modified ECMAScript regular expression grammar</a>
</td></tr>
<tr class="t-dsc">
<td> <code>basic</code>
</td>
<td> Use the basic POSIX regular expression grammar (<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03">grammar documentation</a>).
</td></tr>
<tr class="t-dsc">
<td> <code>extended</code>
</td>
<td> Use the extended POSIX regular expression grammar (<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">grammar documentation</a>).
</td></tr>
<tr class="t-dsc">
<td> <code>awk</code>
</td>
<td> Use the regular expression grammar used by the <i>awk</i> utility in POSIX (<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html#tag_20_06_13_04">grammar documentation</a>)
</td></tr>
<tr class="t-dsc">
<td> <code>grep</code>
</td>
<td> Use the regular expression grammar used by the <i>grep</i> utility in POSIX. This is effectively the same as the <code>basic</code> option with the addition of newline '\n' as an alternation separator.
</td></tr>
<tr class="t-dsc">
<td> <code>egrep</code>
</td>
<td> Use the regular expression grammar used by the <i>grep</i> utility, with the <i>-E</i> option, in POSIX. This is effectively the same as the <code>extended</code> option with the addition of newline '\n' as an alternation separator in addtion to '|'.
</td></tr>
</table>
<p>At most one grammar option must be chosen out of <code>ECMAScript</code>, <code>basic</code>, <code>extended</code>, <code>awk</code>, <code>grep</code>, <code>egrep</code>. If no grammar is chosen, <code>ECMAScript</code> is assumed to be selected. The other options serve as modifiers, such that <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a><span class="br0">(</span><span class="st0">"meow"</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></span> is equivalent to <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../basic_regex.html"><span class="kw1724">std::<span class="me2">regex</span></span></a><span class="br0">(</span><span class="st0">"meow"</span>, std<span class="sy4">::</span><span class="me2">regex</span><span class="sy4">::</span><span class="me2">ECMAScript</span><span class="sy3">|</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></span>
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/regex/basic_regex/constants&action=edit&section=1" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td> <div class="t-dsc-member-div"><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>
<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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