From: "Milovan Z." <milovan.zogovic@...>
Date: 2010-11-21T09:43:02+09:00
Subject: Re: Partial GSUB match / replacement

You can use following regexp:
string.gsub!(/(url\(['"]?)(.+?)(["']?\))/) { "#{$1}#{$2.upcase}#{$3}" }

It is similar to yours with two differences:
1) I'm using (.+?)
question mark here means that + is no longer greedy, it will match only 
to the point where next element in regexp is detected: and in your case 
that is either ", ' or )

2) You cannot use functions on references like "\\2.capitalize" or 
"\\2".capitalize. It is just enterpreted as string. If you want to get 
matches as actual string representations, you should use a block.

[http://ruby-doc.org/core/classes/String.html#M000817]

hope this helps :)

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