form_primary</span></a><span class="special">(</span><span class="identifier">FwdIter</span><span class="special">,</span> <span class="identifier">FwdIter</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> FwdIter<span class="special">&gt;</span> 
    <span class="keyword">static</span> <span class="identifier">string_type</span> <a class="link" href="c_regex_traits.html#idp11541691