A different inconsistency is in gnulib regex also, which matches 'a' to
'\a' but do not match the same if case insensitive is set. I'll still try
to work on that.

Best regards,
Tomasz Dziendzielski

pon., 18 paź 2021, 17:39 użytkownik Tomasz Dziendzielski <
tomasz.dziendzielski@gmail.com> napisał:

> Now I noticed that it introduces inconsistency, but due to a second
> problem - that grep prints lines even when there were no matching strings.
> For example if I run:
> $ echo "a" | grep -E "{1,3}"
> $ echo "a" | grep -i "\a"
> then it returns the string "a" even though it doesn't match anything. With
> my patch it correctly does not print the string but I think for consistency
> it also requires adaptations in case --color was not passed. I'll try to
> work on that.
>
> Best regards,
> Tomasz Dziendzielski
>