On 2026-04-17 09:31, Laurent Lyaudet wrote:
Any possibility to have the part of the POSIX documentation related to this "allowing", please?
POSIX 1003.1-2024 Base Definitions 9.1 "Regular Expression Definitions" "invalid"
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/V1_chap09.html#tag_09_01_07 Since \s is not invalid, GNU grep can treat it as an extension.
