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bug#30686: How to color matched region but also show the nearby context
From: |
Bob Proulx |
Subject: |
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 |
User-agent: |
Mutt/1.9.3 (2018-01-21) |
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