These large regular expressions drive me nuts!

I've got this regex (can�t remember where but I definitely didn�t write it.

str = rereplace(str,
"((((https?:)\/\/)|(www\.|ftp\.))[-[:alnum:]\?%,\.\/&##!@:=\+~_]+[A-Za-z0-9\
/])", "<a href=""\1"" target=""_blank"">\1</a>", "ALL");  


It works well. It will replace anything that matches the form of a url with
the appropriate html to make it active and open in a new window.

My problem is that I don�t want it to replace links that fall between [img]
and [/img] tags

eg I would want this link skipped 
[img]http://www.google.com/logos/lunarnewyear05.gif[/img]

I plan to turn the image links into <a <img tags to have them displayed and
linked rather than just linked



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