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 …
Procedure for building a regular expression to match an XHTML open tag: https://gist.github.com/ferno/013a796b17314266b2b1 …
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And here's the resulting regex which will actually match an XHTML open tag: https://gist.github.com/ferno/0e282c33e08df265bc5e …
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It's not pretty but it's strictly regular which means it'll even run in linear time
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