 <em>n</em>-th capture in <code>patt</code>.
The sequence <code>%0</code> stands for the whole match.
The sequence <code>%%</code> stands for a single&nbsp;<code>%</code>.


</p><h3><a name="cap-query"></a><code>patt / table</code></h3>
<p>
Creates a <em>query capture</em>.
It indexes the given table using as key the first value captured by
<code>patt</code>,
or the whole match if <code>patt</code> produced no value.
The value at that index is the final value of the capture.
If the table does not have that 