Or maybe you are trying to extract data from a download HTML page? If so, use an existing HTML parser (such as HTML::TreeBuilder and HTML::Tree) instead of rolling out your own.
I've found XPath to be very useful. HTML::TreeBuilder::XPath allows you to query the HTML document for information. The Firebug extention for Firefox can help you find the paths.
If PerlMonks is not just an example, I recommend download the XML version of pages by adding the displaytype=xml query parameter to requested URIs. The same advice I gave for HTML applies for XML. Use an existing parser, and XPath is very useful for XML too.
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