You would use HTML::Parser or HTML::TokeParser.
I have to disagree with this bit of advice. Using a fully-fledged HTML parser, IMO, usually does not help in extracting structured data from an html page. Parsing and extracting the markup often adds an unneeded layer of complexity to the task, and offers little in the way of additional "resiliance" to changes in page design/layout (one can reasonably argue that parsing markup results in more sensitivity to such changes).
I agree that parsing html with regex is a bad idea, but it is not the html that one is generally interested in. The html says little or nothing about the structure of the data inside the document. If the document in question is script-generated, I suggest that you simply grab the data using whatever sensible regex you can come up with, and don't mess with parsing the html out of it.
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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>
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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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Want more info? How to link
or How to display code and escape characters
are good places to start.
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