es any input,
independently of success or failure,
and it never produces any capture.
</p>

<p>
The pattern <code>patt</code> cannot contain any open reference
to grammar rules (see <a href="#grammar">grammars</a>).
</p>

<p>
(This is an experimental feature.
There is a good chance it will change in future versions.)
</p>


<h3><a name="op-r"></a><code>lpeg.R ({range})</code></h3>
<p>
Returns a pattern that matches any single character
belonging to one of the given <em>ranges</em>.
Each <code>range</code> i