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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: vampyrebat <at> gmail.com
Subject: bug#20957: closed (Re: bug#20957: 2.21 bug in handling at least
 one -P regular expression)
Date: Fri, 03 Jul 2015 15:24:03 +0000

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Your bug report

#20957: 2.21 bug in handling at least one -P regular expression

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

The explanation is attached below, along with your original report.
If you require more details, please reply to 20957 <at> debbugs.gnu.org.

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

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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

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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)]

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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.

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