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Another situation where regexes are possibly abused - syntax highlighting. Yes, there are a lot of languages where you can sanely highlight /most/ code with regexes, but there's a non-zero number where you need a little more context, such as that provided by an AST (which would also help with autocompletion anyway if the highlighting is being done in the context of an editor).

> For example Chrome's script skipper in the debug tools completely unnecessarily uses regexes rather than a simple list of 'contains'.

That is your example of overkill? More like, exactly the sort of scenario where you'd want to be able to specify a regexp.

I'm consistently infuriated every time a search box in a GUI lacks regex support (which is very nearly all of the time).