From: Nikolai Weibull <now@bitwi.se>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org, Colin Fraizer <emacs-devel@cfraizer.com>,
t.matsuyama.pub@gmail.com
Subject: Re: Patch for lookaround assertion in regexp
Date: Tue, 24 Jan 2012 16:09:36 +0100 [thread overview]
Message-ID: <CADdV=MudiY9RWzP4vW1_SrZpqj-9x9tyorx22nSvOooC+uN1zA@mail.gmail.com> (raw)
In-Reply-To: <jwvehup9nnk.fsf-monnier+emacs@gnu.org>
On Tue, Jan 24, 2012 at 15:40, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>> As an alternative to PCRE, which, as has already been pointed out,
>> doesn’t match any of these requirements, how about RE2?
>> http://code.google.com/p/re2/
>> It’s written in C++, which is a minus, but it should be simple enough
>> to extend it with \c and \s.
> That might work, indeed (tho someone still has to write the
> corresponding code).
> Note that it does not support lookaround assertions.
True, but you can, as far as I know, not do so without (allowing for)
exponential behavior.
I don’t want to detract from the merits of lookaround assertions (or
start a discussion on the subject), but I’ve always found them to be a
sign of improper use of (no longer) regular expressions.
next prev parent reply other threads:[~2012-01-24 15:09 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-23 11:17 Patch for lookaround assertion in regexp Colin Fraizer
2012-01-23 14:11 ` Stefan Monnier
2012-01-23 14:44 ` Tom
2012-01-23 14:50 ` Andreas Schwab
2012-01-23 15:19 ` Tom
2012-01-23 16:14 ` Andreas Schwab
2012-01-23 17:11 ` Stefan Monnier
2012-01-23 18:45 ` Štěpán Němec
2012-01-30 0:31 ` Juri Linkov
2012-01-23 15:31 ` Stefan Monnier
2012-01-24 8:41 ` Nikolai Weibull
2012-01-24 14:40 ` Stefan Monnier
2012-01-24 15:09 ` Nikolai Weibull [this message]
2012-01-24 17:34 ` Stefan Monnier
2012-01-24 23:27 ` David De La Harpe Golden
2012-01-25 6:07 ` Nikolai Weibull
2012-02-14 17:53 ` Daniel Colascione
2012-02-14 18:36 ` Stefan Monnier
2012-02-20 16:19 ` Dimitri Fontaine
2012-09-26 6:55 ` Tomohiro Matsuyama
-- strict thread matches above, loose matches on Subject: below --
2009-06-03 23:04 Tomohiro MATSUYAMA
2009-06-04 4:47 ` Miles Bader
2009-06-04 8:27 ` Deniz Dogan
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