139 lines
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139 lines
14 KiB
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<title>std::basic_regex 常量</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>basic_regex 常量</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>定义于头文件 <code><a href="cpp-header-regex.html"><regex></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 /></span>
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<p> <a href="cpp-regex-syntax_option_type.html"><span class="kw2028">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">icase</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2029">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">nosubs</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2030">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">optimize</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2031">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">collate</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<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="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2033">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">basic</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2034">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">extended</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2035">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">awk</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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 />
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2036">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">grep</span></span></a><span class="sy4">;</span><br />
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<span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">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>
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<a href="cpp-regex-syntax_option_type.html"><span class="kw2037">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">egrep</span></span></a><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-regex-syntax_option_type.html"><span class="kw2027">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">syntax_option_type</span></span></a> multiline <span class="sy1">=</span><br />
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std<span class="sy4">::</span><span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">multiline</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p><span class="t-lc"><a href="cpp-regex-basic_regex.html">std::basic_regex</a></span> 定义数个掌控通用正则表达式语法的常量。</p>
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<p>这些常量复制自 <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>
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<td>值</td>
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<td>效果</td>
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<td><code>icase</code></td>
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<td>应当以不考虑大小写进行字符匹配。</td>
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<td><code>nosubs</code></td>
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<td>进行匹配时，将所有被标记的子表达式 <code><b>(<span class="t-spar">expr</span>)</b></code> 当做非标记的子表达式 <code><b>(?:<span class="t-spar">expr</span>)</b></code> 。不将匹配存储于提供的 <span class="t-lc"><a href="cpp-regex-regex_match.html">std::regex_match</a></span> 结构中，且 <code>mark_count()</code> 为零</td>
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<td><code>optimize</code></td>
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<td>指示正则表达式引擎进行更快的匹配，带有令构造变慢的潜在开销。例如这可能表示将非确定 FSA 转换为确定 FSA 。</td>
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<td><code>collate</code></td>
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<td>形如 <i>"[a-b]"</i> 的字符范围将对本地环境敏感。</td>
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<td><code>multiline</code> <span class="t-mark-rev t-since-cxx17">(C++17)</span></td>
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<td>若选择 ECMAScript 引擎，则指定 <code>^</code> 应该匹配行首，而 <code>$</code> 应该匹配行尾。</td>
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<td><code>ECMAScript</code></td>
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<td>使用<a href="cpp-regex-ecmascript.html">改 ECMAScript 正则表达式文法</a></td>
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<td><code>basic</code></td>
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<td>使用基本 POSIX 正则表达式文法（<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03">文法文档</a>）。</td>
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<td><code>extended</code></td>
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<td>使用扩展 POSIX 正则表达式文法（<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_04">文法文档</a>）。</td>
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<td><code>awk</code></td>
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<td>使用 POSIX 中 <i>awk</i> 工具所用的正则表达式文法（<a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html#tag_20_06_13_04">文法文档</a>）。</td>
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<td><code>grep</code></td>
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<td>使用 POSIX 中 <i>grep</i> 工具所用的正则表达式文法。这等效于 <code>basic</code> 选项附带作为另一种分隔符的换行符 '\n' 。</td>
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<td><code>egrep</code></td>
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<td>使用 POSIX 中 <i>grep</i> 工具带 <i>-E</i> 选项所用的正则表达式文法。这等效于 <code>extended</code> 附带 '|' 之外的作为另一种分隔符的换行符 '\n' 。</td>
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<p><code>ECMAScript</code>, <code>basic</code>, <code>extended</code>, <code>awk</code>, <code>grep</code>, <code>egrep</code> 必须选取至多一个文法选项。若不选取文法选项，则设定为选取 <code>ECMAScript</code> 。其他选项作为修饰符工作，从而 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-regex-basic_regex.html"><span class="kw2000">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> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-regex-basic_regex.html"><span class="kw2000">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>
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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><a href="cpp-regex-syntax_option_type.html"><span class="t-lines"><span>syntax_option_type</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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<td>控制正则表达式行为的通用选项<br />
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<span class="t-mark">(typedef)</span></td>
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