 least n repetitions of x. </td></tr>
    <tr><td><code class="mendoza-code">(at-most n x)</code> </td> <td>  Matches at most n repetitions of x. </td></tr>
    <tr><td><code class="mendoza-code">(if cond patt)</code> </td> <td> Tries to match patt only if cond matches as well. cond will not produce any captures. </td></tr>
    <tr><td><code class="mendoza-code">(if-not cond patt)</code> </td> <td> Tries to match only if cond does not match. cond will not produce any captures. </td></tr>
    <tr><td><code c