Subject: Mention . won't match illegal characters
From: Paul Eggert <[email-masked]>
To: 積丹尼 Dan Jacobson <[email-masked]>
Cc: [email-masked]
Date: Tue, 22 Sep 2020 11:57:02 -0700
List-Id: <debbugs-submit.debbugs.gnu.org>

> $ man grep says
> 
>        The period . matches any single character.
> 
> OK but it should also mention that illegal characters for the current
> locale will never be matched by ".".

This has been done, by adding "It is unspecified whether it matches an encoding 
error" as part of a fix for Bug#30643. Thanks for reporting the problem.