="top" headers="construct greedy"><i>X</i><tt>*</tt></td>
     <td headers="matches"><i>X</i>, zero or more times</td></tr>
 <tr><td valign="top" headers="construct greedy"><i>X</i><tt>+</tt></td>
     <td headers="matches"><i>X</i>, one or more times</td></tr>

 <tr><td valign="top" headers="construct greedy"><i>X</i><tt>{</tt><i>n</i><tt>}</tt></td>
     <td headers="matches"><i>X</i>, exactly <i>n</i> times</td></tr>
 <tr><td valign="top" headers="construct greedy"><i>X</i><tt>{</tt><i>n</i><tt>,}</tt></