ipsis per pair or vector
<li>#&lt;label,func:...&gt; a labelled ellipsis which matches if (func expr); expr is the ellipsis list,
<li>                  label is not optional in this case
<li>#&lt;"regexp"&gt;       pattern is a regular expression to be matched against a string
<li>#&lt;label:"regexp"&gt; a labelled regular expression
</ul>
</samp>

<p>If a label occurs in the result body, the expression it labelled is substituted for it.
</p>

<pre class="indented">
(case* x ((3.14) 'pi))                ; r