Return value (if you don't specify anything through $return) is the value of the last successfully matched items. The information can be found in the documentation in section 'Subrules':
The value associated with a subrule is the value associated with its $return variable (see "Actions" below), or with the
last successfully matched item in the subrule match.
The second problem is that your print statement only belongs to the second rule, i.e. if Pre is matched, nothing is done at all. You might check the return value of your call to $p2->Format to see if a production was parsed successfully
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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or How to display code and escape characters
are good places to start.
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