You might want to have a look at XML::Descent. It's a stream parser so it's (relatively) light on memory usage, and it makes it easy to decide what to keep and what to ignore. It's not quite as simple as listing the elements you want, but it can get pretty darn close to that depending upon how you employ the module.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
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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
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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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