Thanks a bunch

Although the last example by w_a_x_man looks efficient and simpler, I 
needed a very specific match, as it actually matching 
(http://www.google.com) and not even considering the url, then just 
trying to capitalize the parentheses.

I went with
"url(http://www.google.com)".sub /(url\(['"]?)([^\)'"]+)(['"]?\))/, 
"#{$1}#{$2.upcase}#{$3}"

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