From: Joel VanderWerf <vjoel@...>
Date: 2006-03-29T05:09:22+09:00
Subject: Re: Regexp to match strings that _don't_ being with a string

Wes Gamble wrote:
> I have a new wrinkle.
> 
> Now I want to match any line that doesn't have "xyz" or "abc" at the 
> beginning of the line.
> 
> Is there a way to "AND" together the input to the negative lookahead 
> assertion?

For lookaheads, you can get AND by concatenating:


irb(main):001:0> /^(?!abc)(?!xyz)/ =~ "abc"
=> nil
irb(main):002:0> /^(?!abc)(?!xyz)/ =~ " abc"
=> 0
irb(main):003:0> /^(?!abc)(?!xyz)/ =~ "xyz"
=> nil
irb(main):004:0> /^(?!abc)(?!xyz)/ =~ " xyz"
=> 0

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