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Regex lookahead and lookbehind

807606May 24 2007 — edited May 24 2007
I have been reading the regex threads that are being posted once in a while and I often regexes using lookaheads or lookbehinds. I was reading the documentation for these but I am stomped when I see:

(?=X) X, via zero-width positive lookahead

Can anyone explain me what this "zero-width" thing is all about?


thanks
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Locked on Jun 21 2007
Added on May 24 2007
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