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最終更新日時(UTC):
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2025年07月11日 17時16分44秒
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<span itemprop="name">Koichi Murase</span>
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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">regex_traits</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="o">></span>
<span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">regex_traits</span><span class="p">;</span>
<span class="p">}</span>
</code></pre></div>
</p>
<h2>概要</h2>
<p><code>regex_traits</code>は、正規表現ライブラリ<code><regex></code>クラス内で使用される、文字とその変換の規則に関する特性を表すクラスである。</p>
<p>標準ライブラリは <code>std::regex_traits<char></code> と <code>std::regex_traits<wchar_t></code> に対し有効な特殊化を定義する。それ以外の型については、このクラスと同じインタフェースのクラスを実装することで、特定の文字コードの場合に、正規表現の振る舞いをカスタマイズできる。</p>
<h2>メンバ関数</h2>
<h3>構築・破棄</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="regex_traits/op_constructor.html">(constructor)</a></code></td>
<td>コンストラクタ</td>
<td>C++11</td>
</tr>
<tr>
<td><code>~regex_traits() = default;</code></td>
<td>デストラクタ</td>
<td>C++11</td>
</tr>
<tr>
<td><code>regex_traits& operator=(const regex_traits&) = default;</code><br /> <code>regex_traits& operator=(regex_traits&&) = default;</code></td>
<td>代入演算子</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h3>変換</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="regex_traits/translate.html">translate</a></code></td>
<td>与えられた文字と等価の文字を取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/translate_nocase.html">translate_nocase</a></code></td>
<td>与えられた文字列と大文字・小文字を区別せずに等価な文字列を取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/transform.html">transform</a></code></td>
<td>与えられた範囲を、並べ替えのキーとして使用する、文字のシーケンスに変換する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/transform_primary.html">transform_primary</a></code></td>
<td>与えられた文字の範囲を、並べ替えのキーとして使用する、大文字・小文字を区別しない文字のシーケンスに変換する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/lookup_collatename.html">lookup_collatename</a></code></td>
<td>与えられた文字の範囲に対応する照合名を取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/lookup_classname.html">lookup_classname</a></code></td>
<td>与えられた文字の範囲に対応するクラス名を取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/isctype.html">isctype</a></code></td>
<td>文字が特定のクラスに属しているかを判定する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/value.html">value</a></code></td>
<td>文字の整数表現を取得する</td>
<td>C++11</td>
</tr>
<tr>
<td><code><a href="regex_traits/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="regex_traits/getloc.html">getloc</a></code></td>
<td>ロケールを取得する</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>静的メンバ関数</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="regex_traits/length.html">length</a></code></td>
<td>文字列の長さを取得する</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>char_type</code></td>
<td>テンプレートパラメータ<code>CharT</code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>string_type</code></td>
<td><code>char_type</code>文字を要素とする文字列型 <code><a href="../string/basic_string.html">std::basic_string</a><char_type></code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>locale_type</code></td>
<td>ロケール型 <code><a href="../locale/locale.html">std::locale</a></code></td>
<td>C++11</td>
</tr>
<tr>
<td><code>char_class_type</code></td>
<td>正規表現の文字クラス名を表す、<a class="cpprefjp-defined-word" data-desc="処理系定義の動作。処理系によって事前に定めた動作をする" href="../../implementation-compliance.html#dfn-implementation-defined-behavior">実装定義</a>のビットマスク型</td>
<td>C++11</td>
</tr>
</tbody>
</table>
<h2>例</h2>
<p><div class="yata" id="db501a15b21d83194557377dc53790f73b011db3"><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"><span style="color:#ff0000">std::regex_traits</span></span><span class="o"><</span><span class="kt">char</span><span class="o">></span><span class="w"> </span><span class="n">traits</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">class_name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">"alnum"</span><span class="p">;</span><span class="w"> </span><span class="c1">// 正規表現中で[[:alnum:]]のように入力するクラス名</span>
<span class="w"> </span><span class="c1">// 文字'a'がアルファベットと数字のクラスに含まれているかを判定する</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n"><a href="regex_traits/isctype.html">traits.isctype</a></span><span class="p">(</span><span class="sc">'a'</span><span class="p">,</span><span class="w"> </span><span class="n"><a href="regex_traits/lookup_classname.html">traits.lookup_classname</a></span><span class="p">(</span><span class="n"><a href="../string/basic_string/begin.html">class_name.begin()</a></span><span class="p">,</span><span class="w"> </span><span class="n"><a href="../string/basic_string/end.html">class_name.end()</a></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">"'a' is alpha-numeric class"</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">"'a' is not alpha-numeric class"</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>'a' is alpha-numeric class
</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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