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In .Net, I found this great library, HtmlAgilityPack that allows you to easily parse non-well-formed HTML using XPath. I've used this for a couple years in my .Net sites, but I've had to settle for more painful libraries for my Python, Ruby and other projects. Is anyone aware of similar libraries for other languages?
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BeautifulSoup is a good Python library for dealing with messy HTML in clean ways.
For Ruby, I highly recommend Hpricot that Jb Evain pointed out. If you're looking for a faster libxml-based competitor, Nokogiri (see http://tenderlovemaking.com/2008/10/30/nokogiri-is-released/) is pretty good too (it supports both XPath and CSS searches like Hpricot but is faster). There's a basic wiki and some benchmarks.