The tragedy of this SO question is that XHTML open tags are strictly regular and a regex will match them just fine http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags …
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It's not pretty but it's strictly regular which means it'll even run in linear time
"But I didn't want to parse arbitrary HTML. You haven't answered my question" "Too late, I have 4000 votes and the question is closed"
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"Have you tried using an XML parser?" "How do they work?" "Well, quite often they start by tokenising the stream, using regexes"
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This is called an "XX problem". "No, I really do need what I asked for. Please stop second-guessing me and answer the question as stated"
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