GNU bug report logs - #20957
2.21 bug in handling at least one -P regular expression

Previous Next

Full log

View this message in rfc822 format

From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#20957: closed (2.21 bug in handling at least one -P regular
 expression)
Date: Fri, 03 Jul 2015 15:24:02 +0000

[Message part 1 (text/plain, inline)]

Your message dated Fri, 03 Jul 2015 08:23:43 -0700
with message-id <5596A8FF.6050707 <at> cs.ucla.edu>
and subject line Re: bug#20957: 2.21 bug in handling at least one -P regular expression
has caused the debbugs.gnu.org bug report #20957,
regarding 2.21 bug in handling at least one -P regular expression
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
20957: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20957
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: vampyrebat <at> gmail.com
To: bug-grep <at> gnu.org
Subject: 2.21 bug in handling at least one -P regular expression
Date: Thu, 02 Jul 2015 02:55:28 -0500

grep 2.21 incorrectly handles a -P regular expression that 2.20 handled correctly.  Thanks for looking into this.

$ cat file
Here's a line.

This line has one blank line above it.


This line has two blank lines above it.



This line has three blank lines above it.




This line has four blank lines above it.

$ grep-2.20/src/grep -Pzo '(?<=\n\n\n).*' file
This line has two blank lines above it.
This line has three blank lines above it.
This line has four blank lines above it.
$ grep-2.21/src/grep -Pzo '(?<=\n\n\n).*' file
This line has two blank lines above it.

[Message part 3 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: vampyrebat <at> gmail.com, 20957-done <at> debbugs.gnu.org
Subject: Re: bug#20957: 2.21 bug in handling at least one -P regular expression
Date: Fri, 03 Jul 2015 08:23:43 -0700

[Message part 4 (text/plain, inline)]

vampyrebat <at> gmail.com wrote:
> grep 2.21 incorrectly handles a -P regular expression that 2.20 handled correctly.

Thanks for reporting that.  I installed the attached patches.  The first fixes 
the bug; the second is a minor cleanup.

[0001-grep-don-t-mishandle-left-context-in-P.patch (text/x-diff, attachment)]

[0002-grep-simplify-print_line_middle-slightly.patch (text/x-diff, attachment)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.