bug#39678: POSIXLY_CORRECT removal, and oddball regex doc

Looking again at grep bug 39678 I noticed that the bug occurs even when grep is not coloring: echo a | grep -oi --color=never '\a' This outputs nothing and exits with status 0, which is clearly wrong. I tracked this down to a bug buried deep in the bowels of glibc

bug#39678: POSIXLY_CORRECT removal, and oddball regex doc

On Sat, May 21, 2022 at 3:05 AM Paul Eggert wrote: > Looking again at grep bug 39678 I noticed > that the bug occurs even when grep is not coloring: > > echo a | grep -oi --color=never '\a' > > This outputs nothing and exits with status 0, which is clearly wrong. Wron