From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Colin Fraizer" <emacs-devel@cfraizer.com>
Cc: t.matsuyama.pub@gmail.com, emacs-devel@gnu.org
Subject: Re: Patch for lookaround assertion in regexp
Date: Mon, 23 Jan 2012 09:11:09 -0500 [thread overview]
Message-ID: <jwv7h0iike3.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <009001ccd9c0$9bde09f0$d39a1dd0$@cfraizer.com> (Colin Fraizer's message of "Mon, 23 Jan 2012 06:17:34 -0500")
> In 2009, Tomohiro Matsuyama sent a message to this list with a patch
> to add lookahead/lookbehind assertions to Emacs regular expressions
> (regexps). Is there any plan to incorporate this useful feature into
> an official release?
> [IMHO, it is incredibly useful. The only responses to Matsuyama-san's
> message were positive.]
I'd like to replace the current regexp engine with one that does not
suffer from exponential blowup (i.e. using "Thompson's NFA").
Every feature added to the current regexp engine will make it more
difficult to switch, so I'm not too thrilled at the idea of adding
lookaround operators.
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.
Stefan
next prev parent reply other threads:[~2012-01-23 14:11 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 [this message]
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
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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