ass="special">;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class="special">(</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class