Re: How can I search git log with ceratin keyword but without the other keyword?

[Jeff King <peff@peff.net>]

On Fri, Jul 17, 2020 at 09:45:26AM +0800, 孙世龙 sunshilong wrote:

> I wonder why this command doesn't work well.
> I intend to find the comment with the keyword "12" but without "comments"
> whereas the output is something like this:
> 
> git log --perl-regexp --all-match --grep=12 --grep '\b(?!comments\b)\w+'
> commit f5b6c3e33bd2559d6976b1d589071a5928992601
> Author: sunshilong <sunshilong369@gmail.com>
> Date:   2020-04-12 23:00:29 +0800
> 
>     comments 2020.04.12 ng

I think this is the thing I was mentioning earlier. That negative
lookahead means the second one wouldn't match "comments", but it would
still match "2020.04.12" or "ng". So it won't do what you want.

I can't think of a way to do what you want just a regex, but maybe
somebody more clever than me can.

The natural thing to me would be the equivalent of:

  git grep -e 12 --and --not -e comments

The underlying grep machinery in Git understands how to compose multiple
patterns like this, and the command above really does work (though of
course it is searching for lines in a file and not commit messages).

But none of that is exposed via the command-line of "git log". I think
it would be possible to do so, but I'm not sure how tricky it would be
(certainly one complication is that "--not" already means something else
there, but presumably we could have "--grep-and", "--grep-not", etc).

-Peff