class="identifier">range_begin</span><span class="special">(</span><a class="link" href="sub_match.html" title="Struct template sub_match">sub_match</a><span class="special">&lt;</span> <span class="identifier">BidiIter</span> <span class="special">&gt;</span> <span class="keyword">const</span> <span class="special">&amp;</span> sub<span class="special">)</span><span class="special">;</span></pre></div>
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<a name="id-1.3.47.5.13.4.4"></a><h2>Description</h2>
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<div class="varia