At first, I thought that you wanted to parse an HTML file as an input, to get information out of it. For that purpose, I would have suggested that you search for "html parse" at http://search.cpan.org.
But instead I think that you may want to generate a customized HTML content using the file shown above as a template. There are numerous templating engines available in Perl. My personal favorite happens to be Template::Toolkit. Although it is most often used in interactive web-sites, it can be used very well in situations like this, especially when you would like to vary what is produced, e.g.: "Thank you for your payment! :-)" vs. "Pay Up Now, You Scum, Or Your Parakeet Gets It! :-[" depending on the balance.
Start with this tutorial, which deals specifically with how to generate a file (or a string) from a templated source: Template::Tutorial::Datafile.
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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>
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
Want more info? How to link
or How to display code and escape characters
are good places to start.