From: Thibaut Verron <thibaut.verron@gmail.com>
To: Joost Kremers <joostkremers@fastmail.fm>
Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: Regex to match lines with a specific number of words
Date: Sat, 23 Apr 2022 23:46:14 +0200 [thread overview]
Message-ID: <CAFsi02RvREnjuSz8XWrFk=5Kky_WLVKkNqMbj6YftDo2QchFPg@mail.gmail.com> (raw)
In-Reply-To: <877d7fscug.fsf@fastmail.fm>
No problem! The information is in the manual, but hidden behind several
layers of redirection.
I find the emacswiki page on regular expressions both more synthetic and
more informative.
Regarding performances, that's a bit strange.
Is it better if you add ^ and $ around the expression? Or if you add only ^
and search for exactly 30 repetitions (not 30 or more)?
Best wishes,
Thibaut
Le sam. 23 avr. 2022 à 23:34, Joost Kremers <joostkremers@fastmail.fm> a
écrit :
>
> On Sat, Apr 23 2022, Thibaut Verron wrote:
> > The group [:space:] also matches newline characters. So your search has
> > exactly one match, spanning many lines.
> > You can use [:blank:] instead to match spaces and tabs only, for the
> > separator.
>
> Thanks! I never would have thought of that. (Why isn't this mentioned
> explicitly
> in the manual?)
>
> Unfortunately, passing this regexp to `flush-lines` or
> `kill-matching-lines` in
> a file of close to 65000 lines completely cripples Emacs... One CPU core
> runs up
> to 100% and Emacs becomes unresponsive.
>
> Lemme see if a function that goes through the buffer, splits every line on
> white
> space and deletes those that are too long works better.
>
> Thanks, though, for the quick reply!
>
>
>
> --
> Joost Kremers
> Life has its moments
>
next prev parent reply other threads:[~2022-04-23 21:46 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-23 19:44 Regex to match lines with a specific number of words Joost Kremers
2022-04-23 20:58 ` Thibaut Verron
2022-04-23 21:20 ` Joost Kremers
2022-04-23 21:46 ` Thibaut Verron [this message]
2022-04-23 22:11 ` [External] : " Drew Adams
2022-04-23 22:32 ` Thibaut Verron
2022-04-23 22:21 ` Joost Kremers
2022-04-23 22:46 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-04-24 14:31 ` Joost Kremers
2022-04-26 23:55 ` Nick Dokos
2022-04-27 7:23 ` Jean Louis
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