From: Ammar Ali <ammarabuali@...>
Date: 2010-11-21T09:11:49+09:00
Subject: Re: Partial GSUB match / replacement

On Sun, Nov 21, 2010 at 1:04 AM, Shea Barton <shea@sysach.com> wrote:
> I need to match a somewhat complicated match using gsub, then modify
> part of it, leaving the rest intact
>
> for example, replacing
> "url(http://www.google.com)"
> with
> "url(HTTP://WWW.GOOGLE.COM)"
>
> this is the closest answer I can come up with
> gsub /(url\(['"]?)([^\)'"]+)(['"]?\))/, "\\1#{"\\2".capitalize}\\3"
> or
> gsub /(url\(['"]?)([^\)'"]+)(['"]?\))/, "\\1\\2.capitalize\\3"
> but neither of these solutions work
>
> It doen't have to be with gsub, I just thought this would be the most
> straightforward way
>
> ideas?

You can use a block with gsub, where the back-references are
accessible via the $1, $2, etc:

>> "url(http://www.google.com)".gsub(/(url\(['"]?)([^\)'"]+)(['"]?\))/) {"#{$1}#{$2.upcase}#{$3}"}
=> "url(HTTP://WWW.GOOGLE.COM)"

Note that I replaced #capitalize with #upcase to upcase all characters
not just the first one.

HTH,
Ammar