225 lines
13 KiB
HTML
225 lines
13 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::sub_match</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_sub_match skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>sub_match</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></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<td>
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<div>定义于头文件 <code><a href="cpp-header-regex.html"><regex></a></code></div>
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</td>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> BidirIt<span class="sy1">></span><br />
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<span class="kw1">class</span> sub_match<span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>正则表达式引擎用类模板 <code>sub_match</code> ，表示有标记子表达式所匹配的字符序列。 匹配是目标范围中匹配正则表达式的 <code>[begin, end)</code> 对，不过拥有附加的观察器函数以增进代码清晰度。</p>
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<p>只有默认构造函数是可公开访问的。在处理 regex 算法之一期间， <code>sub_match</code> 的实例作为 <span class="t-lc"><a href="cpp-regex-match_results.html">std::match_results</a></span> 容器的一部分正常构造并移居。</p>
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<p>成员函数返回定义的默认值，除非 <span class="t-c"><span class="mw-geshi cpp source-cpp">matched</span></span> 成员为 <code>true</code> 。</p>
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<p><code>sub_match</code> 继承自 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1"><</span>BidirIt, BidirIt<span class="sy1">></span></span></span> ，尽管它不能当做 <span class="t-lc"><a href="cpp-utility-pair.html">std::pair</a></span> 对象，因为成员函数，如交换与赋值，不会按期待工作。</p>
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<h3><span class="mw-headline" id=".E7.B1.BB.E5.9E.8B.E8.A6.81.E6.B1.82">类型要求</span></h3>
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<table class="t-par-begin">
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>BidirIt</code> 必须满足<a href="cpp-named_req-BidirectionalIterator.html"><span style="font-style:italic">老式双向迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyBidirectionalIterator)</span></a> 的要求。</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E7.89.B9.E5.8C.96">特化</span></h3>
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<p>为常见字符类型提供数个特化：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-header">
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<td colspan="2">
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<div>定义于头文件 <code><a href="cpp-header-regex.html"><regex></a></code></div>
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</td>
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</tr>
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<tr class="t-dsc-hitem">
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<td>类型</td>
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<td>定义</td>
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<td><code>csub_match</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match<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>
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<tr class="t-dsc">
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<td><code>wcsub_match</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match<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>
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<td><code>ssub_match</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match<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>
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<tr class="t-dsc">
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<td><code>wssub_match</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match<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>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>成员类型</td>
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<td>定义</td>
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<tr class="t-dsc">
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<td><code>iterator</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">BidirIt</span></span></td>
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<tr class="t-dsc">
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<td><code>value_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-iterator_traits.html"><span class="kw651">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></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>difference_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-iterator_traits.html"><span class="kw651">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">difference_type</span></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>string_type</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1"><</span>value_type<span class="sy1">></span></span></span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.AF.B9.E8.B1.A1">成员对象</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span><span class="t-dsc-small">bool</span> matched</span></span></div>
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</td>
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<td>指示此匹配是否成功<br />
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<span class="t-mark">(公开成员对象)</span></td>
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</tr>
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</table>
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<div class="t-inherited">
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<h2><span class="mw-headline" id=".E7.BB.A7.E6.89.BF.E8.87.AA_std::pair">继承自 <a href="cpp-utility-pair.html"><span style="font-size:0.7em; line-height:130%">std::</span>pair</a></span></h2>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span><span class="t-dsc-small">BidirIt</span> first</span></span></div>
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</div>
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</td>
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<td>匹配序列的开始。<br />
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<span class="t-mark">(公开成员对象)</span></td>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><span class="t-lines"><span><span class="t-dsc-small">BidirIt</span> second</span></span></div>
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</div>
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</td>
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<td>匹配序列的结尾后一位置。<br />
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<span class="t-mark">(公开成员对象)</span></td>
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</tr>
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</table>
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</div>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-regex-sub_match-sub_match.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造匹配对象<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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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.A7.82.E5.AF.9F.E5.99.A8">观察器</span></h5>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-sub_match-length.html"><span class="t-lines"><span>length</span></span></a></div>
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</div>
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</td>
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<td>若存在则返回匹配的长度<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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-sub_match-str.html"><span class="t-lines"><span>str</span><span>operator string_type</span></span></a></div>
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</div>
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</td>
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<td>转换为底层字符串类型<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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-sub_match-compare.html"><span class="t-lines"><span>compare</span></span></a></div>
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</div>
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</td>
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<td>若存在则比较匹配的子序列<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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</table>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-sub_match-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span><span>operator<=></span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>比较一个 <code>sub_match</code> 与另一 <code>sub_match</code> 、字符串或字符<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-sub_match-operator_ltlt.html"><span class="t-lines"><span>operator<<</span></span></a></div>
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</div>
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</td>
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<td>输出匹配的字符子序列<br />
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<span class="t-mark">(函数模板)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-regex_token_iterator.html"><span class="t-lines"><span>regex_token_iterator</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>迭代给定字符串中的所有正则表达式匹配中的指定子表达式，或迭代未匹配的子字符串<br />
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<span class="t-mark">(类模板)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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