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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"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"
"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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"Why do you want to do that?" is frequently code for "I don't know how to do that."
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@qntm fairly sure they use context-free grammars instead -
@zarawesome because, as you've found out, even a simple open tag is madness to identify with a regex
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@qntm When writing a tokenizer, you don't treat "any opening tag" as a single token. As in your gist, you combine smaller tokens with rules. -
@qntm Perl 6 "Rules", interestingly, have facilities such as "ratchet" and "Grammars" for use in such tasks, but go beyond "true regexes".
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