GNU bug report logs - #16865
grep -wP and backreferences

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Message #8 received at 16865 <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: Stephane Chazelas <stephane.chazelas <at> gmail.com>
Cc: 16865 <at> debbugs.gnu.org
Subject: Re: bug#16865: grep -wP and backreferences
Date: Mon, 24 Feb 2014 12:00:08 -0800

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

On Mon, Feb 24, 2014 at 2:01 AM, Stephane Chazelas
<stephane.chazelas <at> gmail.com> wrote:
> Hello,
>
> Backreferences don't work with -w or -x in combination with -P:
>
> $ echo aa | grep -Pw '(.)\1'
> $
>
> Or they work in an unexpected way:
>
> $ echo aa | grep -Pw '(.)\2'
> aa
>
> The fix is simple:
>
>
> --- src/pcresearch.c~   2014-02-24 09:59:56.864374362 +0000
> +++ src/pcresearch.c    2014-02-24 07:33:04.666398105 +0000
> @@ -75,9 +75,9 @@ Pcompile (char const *pattern, size_t si

Thanks a lot for the patch.
I've converted it to a proper commit with NEWS and a test case.
Please ack the attached if it's all ok with you (you're still the "Author:"):

[k.txt (text/plain, attachment)]

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