From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Tom <adatgyujto@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Patch for lookaround assertion in regexp
Date: Mon, 23 Jan 2012 10:31:52 -0500 [thread overview]
Message-ID: <jwvd3aah1y0.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <loom.20120123T154134-961@post.gmane.org> (Tom's message of "Mon, 23 Jan 2012 14:44:21 +0000 (UTC)")
>> OTOH, noone has submitted code to replace the current regexp engine, and
>> I don't forsee I'll have the time to write it myself, so maybe I should
>> just give up on this plan.
> Why not use simply PCRE with a bridge layer which translates from emacs
> regexp format to PCRE? AFAIK the emacs regexes are more or less a subset
> of PCRE, so the translation shouldn't be very difficult.
AFAIK PCRE uses a backtracking implementation, so suffers from the same
exponential blowup as the current code.
> Why reinvent the wheel when PCRE is already there?
I didn't mean to say that I want a fresh new engine written
from scratch. But adding pcre to the list of libraries linked with
Emacs is not nearly enough: someone has to write the bridge layer and it
may turn out not to be as simple as it seems.
Stefan
next prev parent reply other threads:[~2012-01-23 15:31 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 [this message]
2012-01-24 8:41 ` Nikolai Weibull
2012-01-24 14:40 ` Stefan Monnier
2012-01-24 15:09 ` Nikolai Weibull
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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