an> <span class="identifier">e</span><span class="special">,</span>
         <span class="keyword">const</span> <span class="keyword">int</span> <span class="special">(&amp;</span><span class="identifier">submatch</span><span class="special">)[</span><span class="identifier">N</span><span class="special">],</span>
         <span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">match_flag_type</span> <span class="identifier">m</span> <span class="special">=</sp