><a name="cap-p"></a><code>lpeg.Cp ()</code></h3>
<p>
Creates a <em>position capture</em>.
It matches the empty string and
captures the position in the subject where the match occurs.
The captured value is a number.
</p>


<h3><a name="cap-s"></a><code>lpeg.Cs (patt)</code></h3>
<p>
Creates a <em>substitution capture</em>,
which captures the substring of the subject that matches <code>patt</code>,
with <em>substitutions</em>.
For any capture inside <code>patt</code> with a value,
the substring that matched 