On Fri, 3 Jul 2015 20:10:08 -0700
Jim Meyering <jim@meyering.net> wrote:

> Oh, nice! I see that Paul Eggert has just fixed this with
> the following patch:
>   http://git.sv.gnu.org/cgit/grep.git/commit/?id=0e8fda0d880cccd0
> 
> So I'm closing this ticket.
> 

Paul's fix is very nice, I could not found it.

However, following case is not fixed yet.  Not only '.' but also hat
list (e.g. [^a]) should match newline with -z.  So we need clear
RE_HAT_LISTS_NOT_NEWLINE bit.

$ seq 2 | LC_ALL=C grep --null-data '[1-2][^a][1-2]'
1
2
$ seq 2 | LC_ALL=en_US.iso88591 grep --null-data '[1-2][^a][1-2]'