163 lines
11 KiB
HTML
163 lines
11 KiB
HTML
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<title>std::basic_regex<CharT,Traits>::basic_regex</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_basic_regex_basic_regex 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::basic_regex<CharT,Traits>::</span>basic_regex</h1>
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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-basic_regex.html">basic regex</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_regex<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_regex<span class="br0">(</span> <span class="kw4">const</span> CharT<span class="sy2">*</span> s,<br />
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flag_type f <span class="sy1">=</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2032">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_regex<span class="br0">(</span> <span class="kw4">const</span> CharT<span class="sy2">*</span> s, <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> count,<br />
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flag_type f <span class="sy1">=</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2032">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_regex<span class="br0">(</span> <span class="kw4">const</span> basic_regex<span class="sy3">&</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_regex<span class="br0">(</span> basic_regex<span class="sy3">&&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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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> ST, <span class="kw1">class</span> SA <span class="sy1">></span><br /></span>
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<p><span class="kw1">explicit</span> basic_regex<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-string-basic_string.html"><span class="kw1228">std::<span class="me2">basic_string</span></span></a><span class="sy1"><</span>CharT,ST,SA<span class="sy1">></span><span class="sy3">&</span> str,<br /></p>
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flag_type f <span class="sy1">=</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2032">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(6)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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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> ForwardIt <span class="sy1">></span><br /></span>
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<p>basic_regex<span class="br0">(</span> ForwardIt first, ForwardIt last,<br /></p>
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flag_type f <span class="sy1">=</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2032">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(7)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_regex<span class="br0">(</span> <a href="cpp-utility-initializer_list.html"><span class="kw960">std::<span class="me2">initializer_list</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span> init,<br />
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flag_type f <span class="sy1">=</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2032">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">ECMAScript</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(8)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>从按照标志 <code>f</code> 转译的字符序列构造新的正则表达式。</p>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。构造将不匹配内容的空正则表达式。</div>
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<div class="t-li1"><span class="t-li">2)</span> 从空终止字符串 <code>s</code> 构造正则表达式。</div>
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<div class="t-li1"><span class="t-li">3)</span> 从 <code>s</code> 所指向的 <code>count</code> 个的字符序列构造正则表达式。</div>
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<div class="t-li1"><span class="t-li">4)</span> 复制构造函数。通过复制 <code>other</code> 构造正则表达式。</div>
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<div class="t-li1"><span class="t-li">5)</span> 移动构造函数。用移动语义构造拥有 <code>other</code> 内容的正则表达式。</div>
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<div class="t-li1"><span class="t-li">6)</span> 从 string <code>str</code> 构造正则表达式。</div>
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<div class="t-li1"><span class="t-li">7)</span> 范围构造函数。构造拥有范围 <code>[first, last)</code> 内容的正则表达式。</div>
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<div class="t-li1"><span class="t-li">8)</span> initializer_list 构造函数。构造拥有 initializer_list <code>init</code> 内容的正则表达式。</div>
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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>s</td>
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<td>-</td>
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<td>指向空终止字符串的指针</td>
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<tr class="t-par">
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<td>count</td>
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<td>-</td>
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<td>用于初始化 regex 的字符序列长度</td>
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<tr class="t-par">
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<td>first, last</td>
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<td>-</td>
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<td>用于初始化 regex 的字符序列范围</td>
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<td>str</td>
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<td>-</td>
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<td>用作源初始化 regex 的 basic_string</td>
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<td>other</td>
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<td>-</td>
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<td>用作源初始化 regex 的另一 regex</td>
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<td>init</td>
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<td>-</td>
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<td>用于初始化 regex 的 initializer_list</td>
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<td>f</td>
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<td>-</td>
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<td>用于指引转译字符序列为正则表达式的标志</td>
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<td colspan="3">类型要求</td>
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<td colspan="3">-
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<div class="spacer"></div>
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<code>ForwardIt</code> 必须满足<a href="cpp-named_req-ForwardIterator.html"><span style="font-style:italic">老式向前迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyForwardIterator)</span></a> 的要求。</td>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> 可能抛出实现定义的异常。</div>
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<div class="t-li1"><span class="t-li">2-3)</span> 若提供的正则表达式非法则为 <span class="t-lc"><a href="cpp-regex-regex_error.html">std::regex_error</a></span> 。</div>
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<div class="t-li1"><span class="t-li">4)</span> 可能抛出实现定义的异常。</div>
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<div class="t-li1"><span class="t-li">6-8)</span> 若提供的正则表达式非法则为 <span class="t-lc"><a href="cpp-regex-regex_error.html">std::regex_error</a></span> 。</div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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</div>
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<div class="visualClear"></div>
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