GNU bug report logs - #30686
How to color matched region but also show the nearby context noncolored in characters or words?

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Bob Proulx <bob <at> proulx.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#30686: closed (How to color matched region but also show the
 nearby context noncolored in characters or words?)
Date: Sun, 04 Mar 2018 01:27:02 +0000

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Your message dated Sat, 3 Mar 2018 18:26:28 -0700
with message-id <20180303182215108463010 <at> bob.proulx.com>
and subject line Re: bug#30686: How to color matched region but also show the nearby context noncolored in characters or words?
has caused the debbugs.gnu.org bug report #30686,
regarding How to color matched region but also show the nearby context noncolored in characters or words?
to be marked as done.

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From: Peng Yu <pengyu.ut <at> gmail.com>
To: bug-grep <at> gnu.org
Subject: How to color matched region but also show the nearby context
 noncolored in characters or words?
Date: Fri, 2 Mar 2018 22:04:01 -0600

Hi,

I am looking for a feature similar to -A -B -C but not based on lines,
but based on characters or even words. Is it possible with the current
version of grep?

In the following example, I'd like to show the matched region as well
as 3 characters before and after it. But the 3 characters before and
after the match is also showed.

grep --color -o -P '.{0,3}a.{0,3}' <<< '+++++++++++++++++a++++++++++++++++++++'

-- 
Regards,
Peng

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From: Bob Proulx <bob <at> proulx.com>
To: Peng Yu <pengyu.ut <at> gmail.com>
Cc: 30686-done <at> debbugs.gnu.org
Subject: Re: bug#30686: How to color matched region but also show the nearby
 context noncolored in characters or words?
Date: Sat, 3 Mar 2018 18:26:28 -0700

tags 30686 + notabug
thanks

Peng Yu wrote:
> I am looking for a feature similar to -A -B -C but not based on lines,
> but based on characters or even words. Is it possible with the current
> version of grep?
>
> In the following example, I'd like to show the matched region as well
> as 3 characters before and after it. But the 3 characters before and
> after the match is also showed.
> 
> grep --color -o -P '.{0,3}a.{0,3}' <<< '+++++++++++++++++a++++++++++++++++++++'

Those three characters before and after as you say are also part of
the pattern and are also part of the match.  If you want to then only
color a subset in a second grep you can always do that.

  grep -o -P '.{0,3}a.{0,3}' <<< '+++++++++++++++++a++++++++++++++++++++' | grep --color 'a'
  +++a+++
     ^ only the 'a' is highlighted

Bob

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