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<div class="identifier-type">class template</div><div class="header"><regex></div><h1 itemprop="name"><span class="namespace" title="namespace std">std::</span><span class="token">basic_regex</span><span class="cpp cpp11" title="C++11で追加">(C++11)</span></h1>
<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="k">namespace</span><span class="w"> </span><span class="nn">std</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">template</span><span class="w"> </span><span class="o"><</span><span class="k">class</span><span class="w"> </span><span class="nc">charT</span><span class="p">,</span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">traits</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n"><a href="regex_traits.html">regex_traits</a></span><span class="o"><</span><span class="n">charT</span><span class="o">></span><span class="w"> </span><span class="o">></span>
<span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="nc">basic_regex</span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">regex</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">basic_regex</span><span class="o"><</span><span class="kt">char</span><span class="o">></span><span class="p">;</span>
<span class="w"> </span><span class="k">using</span><span class="w"> </span><span class="n">wregex</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">basic_regex</span><span class="o"><</span><span class="kt">wchar_t</span><span class="o">></span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>basic_regex</code>クラステンプレートは、<code>charT</code>型の文字列から構築する正規表現を表す。
<code>charT</code>は、<code>char</code>型、<code>wchar_t</code>型のような文字型である。
<code>traits</code>は正規表現の文字・変換に関する特性である。
利便性のために、<code>charT</code>を<code>char</code>特殊化した<code>regex</code>と、<code>charT</code>を<code>wchar_t</code>特殊化した<code>wregex</code>が用意されている。</p>
<p><code>basic_regex</code>オブジェクトの内部表現や、正規表現アルゴリズムが<code>basic_regex</code>オブジェクトの内部表現にどのようにアクセスするかは規定されない。
ユーザーはそれらを意識することなく、<code>basic_regex</code>オブジェクトを正規表現アルゴリズムに渡すだけでよい。</p>
<p>このクラス中で発生したエラーは、正規表現アルゴリズムが<code><a href="regex_error.html">regex_error</a></code>型の<a class="cpprefjp-defined-word" data-desc="問題が発生したときに、現在実行位置を過去に通過・記録した位置に戻し、文脈情報を添えて紐づけられた処理(例外ハンドラー)を呼び出す仕組み。またはその事態">例外</a>を送出することで通知される。</p>
<h2>メンバ関数</h2>
<h3>構築</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="basic_regex/op_destructor.html">(destructor)</a></code></td>
<td>デストラクタ</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>代入</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/op_assign.html">operator=</a></code></td>
<td>正規表現を代入する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="basic_regex/assign.html">assign</a></code></td>
<td>正規表現を代入する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>定数操作</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/mark_count.html">mark_count</a></code></td>
<td>正規表現内のキャプチャグループの数を返す</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="basic_regex/flags.html">flags</a></code></td>
<td>最後に設定された正規表現フラグを返す</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>ロケール</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/imbue.html">imbue</a></code></td>
<td>ロケールを設定する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="basic_regex/getloc.html">getloc</a></code></td>
<td>現在のロケールを得る</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>交換</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/swap.html">swap</a></code></td>
<td>正規表現オブジェクトを交換する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>メンバ定数</h2>
<p>静的メンバ定数は利便性のために<code>std::regex_constants</code>で定義される定数の同義語として提供される。</p>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>icase</code></td>
<td><code>static constexpr regex_constants::syntax_option_type icase = regex_constants::icase;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>nosubs</code></td>
<td><code>static constexpr regex_constants::syntax_option_type nosubs = regex_constants::nosubs;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>optimize</code></td>
<td><code>static constexpr regex_constants::syntax_option_type optimize = regex_constants::optimize;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>collate</code></td>
<td><code>static constexpr regex_constants::syntax_option_type collate = regex_constants::collate;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>ECMAScript</code></td>
<td><code>static constexpr regex_constants::syntax_option_type ECMAScript = regex_constants::ECMAScript;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>basic</code></td>
<td><code>static constexpr regex_constants::syntax_option_type basic = regex_constants::basic;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>extended</code></td>
<td><code>static constexpr regex_constants::syntax_option_type extended = regex_constants::extended;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>awk</code></td>
<td><code>static constexpr regex_constants::syntax_option_type awk = regex_constants::awk;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>grep</code></td>
<td><code>static constexpr regex_constants::syntax_option_type grep = regex_constants::grep;</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>egrep</code></td>
<td><code>static constexpr regex_constants::syntax_option_type egrep = regex_constants::egrep;</code></td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>メンバ型</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>value_type</code></td>
<td><code>charT</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>traits_type</code></td>
<td><code>traits</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>string_type</code></td>
<td><code>traits::string_type</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>flag_type</code></td>
<td><code>regex_constants::syntax_option_type</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>locale_type</code></td>
<td><code>traits::locale_type</code></td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>非メンバ関数</h2>
<h3>交換</h3>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/swap_free.html">swap</a></code></td>
<td>二つの正規表現オブジェクトを交換する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>推論補助</h2>
<table border="1" bordercolor="#888" style="border-collapse:collapse">
<thead>
<tr>
<th>名前</th>
<th>説明</th>
<th>対応バージョン</th>
</tr>
</thead>
<tbody>
<tr>
<td><code><a href="basic_regex/op_deduction_guide.html">(deduction_guide)</a></code></td>
<td>クラステンプレートの推論補助</td>
<td>C++17</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="cb560faa5fcafe4dd683d4747ef86b141637e70f"><div class="codehilite"><pre><span></span><code><span class="cp">#include <a href="../iostream.html"><iostream></a></span>
<span class="cp">#include <a href="../regex.html"><regex></a></span>
<span class="cp">#include <a href="../string.html"><string></a></span>
<span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span>
<span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../string/basic_string.html">std::string</a></span><span class="w"> </span><span class="n">input</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"12345"</span><span class="p">;</span>
<span class="w"> </span><span class="c1">// 全てが数字か判定するための正規表現</span>
<span class="w"> </span><span class="n"><span style="color:#ff0000">std::regex</span></span><span class="w"> </span><span class="n">re</span><span class="p">(</span><span class="sa">R</span><span class="s">"</span><span class="dl">(</span><span class="s">^\d+$</span><span class="dl">)</span><span class="s">"</span><span class="p">);</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="regex_match.html">std::regex_match</a></span><span class="p">(</span><span class="n">input</span><span class="p">,</span><span class="w"> </span><span class="n">re</span><span class="p">))</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"全て数字です"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n"><a href="../iostream/cout.html">std::cout</a></span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"数字以外が含まれています"</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n"><a href="../ostream/endl.html">std::endl</a></span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
</div></p>
<h3>出力</h3>
<p><pre><code>全て数字です
</code></pre></p>
<h2>バージョン</h2>
<h3>言語</h3>
<ul>
<li>C++11</li>
</ul>
<h3>処理系</h3>
<ul>
<li><a href="../../implementation.html#clang">Clang</a>: 3.0 <span aria-label="検証済" role="img" title="検証済">✅</span>, 3.1 <span aria-label="検証済" role="img" title="検証済">✅</span>, 3.2 <span aria-label="検証済" role="img" title="検証済">✅</span>, 3.3 <span aria-label="検証済" role="img" title="検証済">✅</span>, 3.4 <span aria-label="検証済" role="img" title="検証済">✅</span>, 3.5 <span aria-label="検証済" role="img" title="検証済">✅</span>, 3.6 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#gcc">GCC</a>: 4.9.0 <span aria-label="検証済" role="img" title="検証済">✅</span>, 4.9.1 <span aria-label="検証済" role="img" title="検証済">✅</span>, 4.9.2 <span aria-label="検証済" role="img" title="検証済">✅</span>, 5.0.0 <span aria-label="検証済" role="img" title="検証済">✅</span></li>
<li><a href="../../implementation.html#icc">ICC</a>: ??</li>
<li><a href="../../implementation.html#visual_cpp">Visual C++</a>: ??</li>
</ul></div>
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