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Re: Performance of `re-search-backward' vs `re-search-forward'


From: Stefan Monnier
Subject: Re: Performance of `re-search-backward' vs `re-search-forward'
Date: Mon, 12 Apr 2021 11:13:34 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

> I seem to (very vaguely) remember reading that `re-search-backward' is
> significantly slower than `re-search-forward'.  However, I can't find
> anything about it in the docstring (nor in the Elisp reference) now.  Am
> I even correct?

I haven't looked at the code recently so my memory might be off, but
I can't think of any reason why it should be noticeably slower, no.

Maybe you're confusing it with `looking-back` which is much slower than
`looking-at`?


        Stefan




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