GNU bug report logs - #62745
Color only capture group

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Package: grep;

Reported by: Dan Jacobson <jidanni <at> jidanni.org>

Date: Mon, 10 Apr 2023 06:57:02 UTC

Severity: normal

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Report forwarded to bug-grep <at> gnu.org:
bug#62745; Package grep. (Mon, 10 Apr 2023 06:57:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Dan Jacobson <jidanni <at> jidanni.org>:
New bug report received and forwarded. Copy sent to bug-grep <at> gnu.org. (Mon, 10 Apr 2023 06:57:02 GMT) Full text and rfc822 format available.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Dan Jacobson <jidanni <at> jidanni.org>
To: bug-grep <at> gnu.org
Subject: Color only capture group
Date: Mon, 10 Apr 2023 14:55:05 +0800

I only want the c colored when doing:
$ echo abcedc|grep --color 'b\(c\)'
I read (info "(grep) Environment Variables")
but it apparently doesn't have much to do with what I want.
Therefore I hereby propose it as a new feature.
grep (GNU grep) 3.8
Information forwarded to bug-grep <at> gnu.org:
bug#62745; Package grep. (Wed, 12 Apr 2023 06:52:01 GMT) Full text and rfc822 format available.

Message #8 received at 62745 <at> debbugs.gnu.org (full text, mbox):

From: Carlo Arenas <carenas <at> gmail.com>
To: Dan Jacobson <jidanni <at> jidanni.org>
Cc: 62745 <at> debbugs.gnu.org
Subject: Re: bug#62745: Color only capture group
Date: Tue, 11 Apr 2023 23:51:34 -0700

You can do that already with PCRE2 and a lookbehind:

  echo abcedc|ggrep --color -P '(?=b)c'
Information forwarded to bug-grep <at> gnu.org:
bug#62745; Package grep. (Wed, 12 Apr 2023 06:57:01 GMT) Full text and rfc822 format available.

Message #11 received at 62745 <at> debbugs.gnu.org (full text, mbox):

From: Carlo Arenas <carenas <at> gmail.com>
To: Dan Jacobson <jidanni <at> jidanni.org>
Cc: 62745 <at> debbugs.gnu.org
Subject: Re: bug#62745: Color only capture group
Date: Tue, 11 Apr 2023 23:56:11 -0700

On Tue, Apr 11, 2023 at 11:51 PM Carlo Arenas <carenas <at> gmail.com> wrote:
>
>   echo abcedc|ggrep --color -P '(?=b)c'

typo:

   echo abcedc|ggrep --color -P '(?<=b)c'

`ggrep`, would be called grep in your environment
Information forwarded to bug-grep <at> gnu.org:
bug#62745; Package grep. (Wed, 12 Apr 2023 07:09:02 GMT) Full text and rfc822 format available.

Message #14 received at 62745 <at> debbugs.gnu.org (full text, mbox):

From: Dan Jacobson <jidanni <at> jidanni.org>
To: Carlo Arenas <carenas <at> gmail.com>
Cc: 62745 <at> debbugs.gnu.org
Subject: Re: bug#62745: Color only capture group
Date: Wed, 12 Apr 2023 15:07:54 +0800

Indeed,
echo abcedc|grep --color -P '(?<=b)c'
works!
Let's hope this example gets mentioned on there on the Info page.
This bug report was last modified 1 year and 261 days ago.

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