Re: grep -r: add default "."

[RVP <rvp%SDF.ORG@localhost>]

On Sun, 4 Sep 2022, Alistair Crooks wrote:

> agcre was not really meant to be a drop-in replacement for grep:
>
> - defaults to extended regexps
> - does most (sane/useful) perl extensions
> - does utf-8 searching and matching
> - is built around a vm style of matching, rather than a dfa, or aho
> corasick-style optimizations, so sacrifices performance for protection
> against sociopathic expressions
> - extends the api to do backwards searching (similar to memrchr in a byte
> string, where memchr does the forward searching)
>
> But certainly has none of the production-ready style of matching that would
> be necessary for a full grep replacement, to say nothing of atf tests (it
> has its own test suite, just not atf)

Neither OpenBSD's nor FreeBSD's grep use Aho-Corasick for fgrep: OpenBSD's
grep looks like the non-GNU version in `usr.bin/grep'. Both use the system
(Spencer?) regex for the heavy lifting; and, FreeBSD's fgrep is just
regcomp(REG_NOSPEC) :).

-RVP