From: Joel VanderWerf <vjoel@...>
Date: 2006-02-04T07:03:21+09:00
Subject: Re: Regexp question for doing "and" searches

Jeff Cohen wrote:
> Just can't quite figure this one out.
> 
> Given a search phrase like "one two three", I want to search a list of 
> text strings for onex that contain ALL of those words, but not 
> necessarily in that order.
> 
> The hard part for me is the "not necessarily in that order".
> 
> Using '\b(one|two|three)\b' will match if at least one of them occurs in 
> any order, but I need all of them to match *and* be in any order.
> 
> two one three => match
> one three => does not match

Seems to work:

s = "foo two bar three zap one"
rx = /^(?=.*one)(?=.*two).*three/m

p (rx =~ s)

s = "one three"
p (rx =~ s)

Works like this too:
rx = /^(?=.*one)(?=.*two)(?=.*three)/m

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407