From: Paul Mckibbin <pmckibbin@...>
Date: 2008-03-25T11:07:16+09:00
Subject: Re: Replacing part of a matched regular expression using gsu

Rodrigo Bermejo wrote:
>  word.gsub!(/axb/) {"102,"}

Except that will consume the a and b in addition to the x.

Try:
word = "groupaxbas"
word.gsub!(/(a)x(?=b)/,'\1102,')
p word


Unfortunately, Ruby's regex processor doesn't seem to have the zero 
width positive lookbehind, so I couldn't quite work out how not to 
consume the preceding 'a', so I needed to group and replace it. Zero 
width positive lookahead and negative lookahead both seem to work ok, 
although I've yet to see any documentation on these.

Mac
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