a good and complete grep manual?

[Bruce Marshall]

On Friday 27 July 2007, Bram Kuijper wrote:
> I have the idea that grep isn't that elaborated as regexps in Perl, but
> to find out what grep actually does accept and what not is quite some
> hassle. For example, does it accept escape characters like \d (I guess
> not?).

There are various flavors of grep....     grep,  egrep,  fgrep    and maybe 
others.    egrep for instance will handle more regexps than grep I think.