Sometimes I use GNU/Linux, sometimes MacOS.  On MacOS, I have:

grep --version
grep (BSD grep) 2.5.1-FreeBSD

Bob

On Wed, Sep 30, 2020 at 5:19 AM Jean Louis <bugs@gnu.support> wrote:
* Robert Weiner <rsw@gnu.org> [2020-09-30 07:25]:
> {C-h h f g} works fine here.

I really wonder, could you tell me which system are you using? Is it
GNU/Linux or other?

Which grep is used there?

Jean