 <tr><td valign="top" headers="construct classes"><tt>[a-z&&[^m-p]]</tt></td>

     <td headers="matches"><tt>a</tt> through <tt>z</tt>,
          and not <tt>m</tt> through <tt>p</tt>: <tt>[a-lq-z]</tt>(subtraction)</td></tr>
 <tr><th>&nbsp;</th></tr>

 <tr align="left"><th colspan="2" id="predef">Predefined character classes</th></tr>

 <tr><td valign="top" headers="construct predef"><tt>.</tt></td>
     <td headers="matches">Any character (may or may not match <a href="#lt">line terminators</a>)</td></tr