Subject: bug#38223: grep >=2.28 cannot handle -wF correctly under LANG=ja_JP.eucjp

From: Paul Eggert <[email-masked]>
Date: Fri, 15 Nov 2019 13:38:38 -0800

On 11/15/19 11:06 AM, NIDE, Naoyuki wrote:
> echo ba | LANG=ja_JP.eucjp grep -F -w a
> outputs ba, but should output nothing.

I don't observe this problem with GNU grep 3.3 on Fedora 31. Please try 
upgrading to grep 3.3, the current release. If that doesn't work, please send 
more details about your configuration: what OS you're using, how you built 
'grep', etc. Thanks.