GNU bug report logs - #11663
Incorrect regexp match with explicitly numbered blocks

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Vitalie Spinu <spinuvit <at> gmail.com>
Subject: bug#11663: closed (Re: bug#11663: Incorrect regexp match with
 explicitly numbered blocks)
Date: Sun, 10 Jun 2012 08:58:02 +0000

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Your bug report

#11663: Incorrect regexp match with explicitly numbered blocks 

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 11663 <at> debbugs.gnu.org.

-- 
11663: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=11663
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Vitalie Spinu <spinuvit <at> gmail.com>
Cc: 11663-done <at> debbugs.gnu.org
Subject: Re: bug#11663: Incorrect regexp match with explicitly numbered blocks
Date: Sun, 10 Jun 2012 10:55:23 +0200

Thanks for the report.  The problem was that at_begline_loc_p wasn't
updated when the `(?N:' syntax was added.  I have also fixed a problem
with preceding backslashes that causes the ^ in patterns like "\\\\(^a)"
to be incorrectly taken non-literally.

Andreas.

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Andreas Schwab, schwab <at> linux-m68k.org
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From: Vitalie Spinu <spinuvit <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Incorrect regexp match with explicitly numbered blocks 
Date: Sat, 09 Jun 2012 23:26:28 +0200

Hi, 

Assume this buffer's text. M-x regexp-builder and try this regexp
"\\(?:^Hi\\)" which works correctly. Modify to "\\(?2:^Hi\\)" and you
will see that ^ is taken literally and does not match bol anymore.

I've tried this in emacs 23 and on GNU Emacs 24.1.50.1
(i686-pc-linux-gnu, GTK+ Version 3.4.2) of 2012-06-08 on lakoocha,
modified by Debian.

Vitalie.

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