"match_results.html#boost_regex.match_results.max_size">max_size</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">bool</span> <a class="link" href="match_results.html#boost_regex.match_results.empty">empty</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="comment">// element access:</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_