[Toybox] grep and empty regexes

[Ed Maste]

On Mon, 29 Jul 2019 at 15:03, enh <enh at google.com> wrote:
>
> macOS, though,
> definitely doesn't use the GNU one. i don't think they use the NetBSD
> one either. theirs is the worst grep i've used since the early 1990s
> at least.

Yeah - macOS is using an older version of FreeBSD's non-default grep.
(Almost?) all of the known issues have been fixed in FreeBSD after
they took it, and we should be able to make it our default grep
shortly. The -r option is definitely fixed :)