GNU bug report logs - #30643
Mention . won't match illegal characters

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

From: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
To: bug-grep <at> gnu.org
Subject: Mention . won't match illegal characters
Date: Wed, 28 Feb 2018 14:30:24 +0800

$ 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 ".".

$ LC_ALL=C           grep  .東看 x.html|qprint -e
          <p>=E5?=91=E6=9D=B1=E7=9C=8B</p>
$ LC_ALL=zh_TW.UTF-8 grep  .東看 x.html|qprint -e
$

Also mention it on (info "(grep) Fundamental Structure").

Message #10 received at 30643-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: 積丹尼 Dan Jacobson <jidanni <at> jidanni.org>
Cc: 30643-done <at> debbugs.gnu.org
Subject: Mention . won't match illegal characters
Date: Tue, 22 Sep 2020 11:57:02 -0700

> $ 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.

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