 class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <a class="link" href="basic_regex.html#idp114733024-bb"><span class="identifier">mark_count</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="identifier">regex_id_type</span> <a class="link" href="basic_regex.html#idp114733760-bb"><span class="identifier">regex_id</span></a><span class="special">(</span><span 