From: Wes Gamble <weyus@...>
Date: 2006-03-29T05:16:37+09:00
Subject: Re: Regexp to match strings that _don't_ being with a string

Thanks, that makes sense since the lookahead doesn't "consume" right?

WG
Joel VanderWerf wrote:
> 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


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