100 lines
8.2 KiB
HTML
100 lines
8.2 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::match_results<BidirIt,Alloc>::operator[]</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_match_results_operator_at skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::match_results<BidirIt,Alloc>::</span>operator[]</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-regex.html">regex</a>‎ | <a href="cpp-regex-match_results.html">match results</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">const_reference operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> size_type n <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1">></span> <span class="nu0">0</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1"><</span> size<span class="br0">(</span><span class="br0">)</span></span></span> ，则返回到 <span class="t-lc"><a href="cpp-regex-sub_match.html">std::sub_match</a></span> 的引用，它表示第 <i>n</i> 个捕获的<a href="cpp-regex-ecmascript.html#.E5.AD.90.E8.A1.A8.E8.BE.BE.E5.BC.8F">有标记子表达式</a>所匹配的目标序列部分。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则返回到 <span class="t-lc"><a href="cpp-regex-sub_match.html">std::sub_match</a></span> 的引用，它表示返回整个匹配的正则表达式所匹配的目标序列部分。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1">>=</span> size<span class="br0">(</span><span class="br0">)</span></span></span> ，则返回到 <span class="t-lc"><a href="cpp-regex-sub_match.html">std::sub_match</a></span> 的引用，它表示不配的子表达式（目标序列的空子范围）。</p>
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<p>除非 <span class="t-c"><span class="mw-geshi cpp source-cpp">ready<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">true</span></span></span> ，否则行为未定义。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>n</td>
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<td>-</td>
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<td>指定要返回哪个匹配的整数</td>
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</tr>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>返回到表示目标序列中指定的匹配子范围的 <span class="t-lc"><a href="cpp-regex-sub_match.html">std::sub_match</a></span> 的引用。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <regex></span>
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<span class="co2">#include <string></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> target<span class="br0">(</span><span class="st0">"baaaby"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-regex-match_results.html"><span class="kw2010">std::<span class="me2">smatch</span></span></a> sm<span class="sy4">;</span>
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<a href="cpp-regex-basic_regex.html"><span class="kw2000">std::<span class="me2">regex</span></span></a> re1<span class="br0">(</span><span class="st0">"a(a)*b"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-regex-regex_search.html"><span class="kw2013">std::<span class="me2">regex_search</span></span></a><span class="br0">(</span>target, sm, re1<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"entire match: "</span> <span class="sy1"><<</span> sm<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
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<span class="sy1"><<</span> <span class="st0">"submatch #1: "</span> <span class="sy1"><<</span> sm<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-regex-basic_regex.html"><span class="kw2000">std::<span class="me2">regex</span></span></a> re2<span class="br0">(</span><span class="st0">"a(a*)b"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-regex-regex_search.html"><span class="kw2013">std::<span class="me2">regex_search</span></span></a><span class="br0">(</span>target, sm, re2<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"entire match: "</span> <span class="sy1"><<</span> sm<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
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<span class="sy1"><<</span> <span class="st0">"submatch #1: "</span> <span class="sy1"><<</span> sm<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">entire match: aaab
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submatch #1: a
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entire match: aaab
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submatch #1: aa</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-match_results-str.html"><span class="t-lines"><span>str</span></span></a></div>
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</div>
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</td>
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<td>返回特定子匹配的字符序列<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</div>
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<div class="visualClear"></div>
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