GNU bug report logs - #5393
Patch for lookaround assertion in regexp

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Package: emacs;

Reported by: Tomohiro MATSUYAMA <t.matsuyama.pub <at> gmail.com>

Date: Fri, 15 Jan 2010 18:46:02 UTC

Severity: wishlist

Tags: patch

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

Forwarded to http://lists.gnu.org/archive/html/emacs-devel/2012-01/msg00732.html

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Message #21 received at 5393 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>, stephen.berman <at> gmx.net, rgm <at> gnu.org,
 5393 <at> debbugs.gnu.org, t.matsuyama.pub <at> gmail.com
Subject: Re: Patch for lookaround assertion in regexp
Date: Thu, 27 Jun 2019 21:17:05 +0200

>That looks pretty cool to me, but there was next to no discussion about this at the time (2009), which is a bit odd... 

Didn't see it until now myself, and it looks useful, but perhaps it's unwise to add features that couldn't easily make it into a DFA-based engine. Positive lookahead maybe, the rest probably not. (The old engine would need to be kept around for backrefs, but those are fairly rare in actual use.)
This bug report was last modified 4 years and 278 days ago.

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