From: OZAWA -Crouton- Sakuro <crouton@...>
Date: 2001-11-09T14:21:23+09:00
Subject: [ruby-talk:24738] Re: Negate grep pattern match?

At Fri, 9 Nov 2001 13:57:05 +0900,
Jos Backus wrote:

> p a.grep(/a/)

    grep(pat)
and grep(pat) block

should be considered to be shortcuts for

    select{|item| pat==item }
and select{|item| if pat==item then block(item); true; else false; end }

respectively.

> Now how do I retrieve those array elements that do not match /a/? In Perl one
> can say @a = grep(!/a/, qw(aap noot mies)); does Ruby have a similar shortcut?

If you are only to select items with 'grep', try 'reject' for negative selection.

p a.reject{|x| /a/ =~ x}

-- 
OZAWA -Crouton- Sakuro
E-Mail: mailto:crouton@weatherlight.org
   Web: http://www.weatherlight.org/~crouton/
   PGP: C98F 74E0 AEEB 4578 1DFC  F650 3BE0 9627 11FC C9F5
VERBA VOLANT, SCRIPTA MANENT