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> That's a regexp with a lot of backtracking, I think (i.e., elements that
> can be matched both by the ?'s as well as the two *'s). So matching
> this will be slow, which results in the hangs you're seeing when Emacs
> is trying to match that to the text in the buffer.
Would it make sense to say more about this point in the Emacs Lisp Manual
where it describes regexps?
--
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)