[Bug 287396] grep(1): BSD grep \w matches differently from GNU grep

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287396

            Bug ID: 287396
           Summary: grep(1): BSD grep \w matches differently from GNU grep
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: elfham+freebsd@gmail.com

It seems that the \w character class in BSD grep matches differently compared
to GNU grep.
Specifically, GNU grep's \w matches the underscore (_), whereas BSD grep does
not.
Is this behavior intentional?


admin@freebsd14:~ $ cat /etc/os-release
NAME=FreeBSD
VERSION="14.3-RELEASE"
VERSION_ID="14.3"
ID=freebsd
ANSI_COLOR="0;31"
PRETTY_NAME="FreeBSD 14.3-RELEASE"
CPE_NAME="cpe:/o:freebsd:freebsd:14.3"
HOME_URL="https://FreeBSD.org/"
BUG_REPORT_URL="https://bugs.FreeBSD.org/"
admin@freebsd14:~ $ echo $LANG
C.UTF-8
admin@freebsd14:~ $ grep --version
grep (BSD grep, GNU compatible) 2.6.0-FreeBSD
admin@freebsd14:~ $ echo a_ | grep -o '\w*'
a
admin@freebsd14:~ $ ggrep --version
ggrep (GNU grep) 3.11
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Mike Haertel and others; see
<https://git.savannah.gnu.org/cgit/grep.git/tree/AUTHORS>.

grep -P uses PCRE2 10.45 2025-02-05
admin@freebsd14:~ $ echo a_ | ggrep -o '\w*'
a_
admin@freebsd14:~ $

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