>\</span><span class="identifier">C</span></code>
                </p>
              </td>
<td>
                <p>
                  Matches a single code point: in Boost regex this has exactly the
                  same effect as a "." operator.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="special">\</span><span class="identifier">X</span></code>
                </p>
              </td>
<td>
                <p>
   