From: Lars Ingebrigtsen <larsi@gnus.org>
To: "Daniel R. Grayson" <danielrichardgrayson@gmail.com>
Cc: 55744@debbugs.gnu.org
Subject: bug#55744: infinite loop
Date: Wed, 01 Jun 2022 17:35:04 +0200 [thread overview]
Message-ID: <87a6aw4ct3.fsf@gnus.org> (raw)
In-Reply-To: <CABWu70GoQjcc-LJufu9NP4DSOuYuBtsOzLpj-bNJYrTV_BPouA@mail.gmail.com> (Daniel R. Grayson's message of "Wed, 1 Jun 2022 07:27:22 -0700")
"Daniel R. Grayson" <danielrichardgrayson@gmail.com> writes:
> Okay, I did that, and it seems to be this:
>
> (defconst M2-mode-font-lock-keywords
> '("///\\(/?/?[^/]\\|\\(//\\)*////[^/]\\)*\\(//\\)*///" .
> 'font-lock-string-face) )
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.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
next prev parent reply other threads:[~2022-06-01 15:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-31 19:49 bug#55744: infinite loop Daniel R. Grayson
2022-05-31 20:12 ` Lars Ingebrigtsen
2022-05-31 20:26 ` Daniel R. Grayson
2022-05-31 20:28 ` Lars Ingebrigtsen
2022-05-31 20:42 ` Daniel R. Grayson
2022-06-01 2:29 ` Lars Ingebrigtsen
2022-06-01 14:27 ` Daniel R. Grayson
2022-06-01 15:35 ` Lars Ingebrigtsen [this message]
2022-06-01 15:47 ` Daniel R. Grayson
2022-06-01 15:48 ` Lars Ingebrigtsen
2022-06-06 22:15 ` Richard Stallman
2022-06-06 22:46 ` Daniel R. Grayson
2022-06-07 2:28 ` Eli Zaretskii
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