Regex needed to change urls to a href's (links) within a string; Coldfusion

I'm looking for a Coldfusion code snippet to parse a block of text and convert any of the following plain text sub-strings:

http://www.site.com
http://www.site.com/example/123.htm
www.site.com
www.site.com/example/123.htm
subdomain.site.com
subdomain.site.com/example/123.htm

to hyperlinks.

I know this can be done using the rereplacenocase command; I just don't know how! :) I've never really understood regex's and need this ASAP to finish off some work on a site.

An example of how to do this in PHP is here:
http://immike.net/blog/2007/04/06/5-regular-expressions-every-web-programmer-should-know/
...under the 'Matching a URL' heading.

Basically, I'd like some code to replicate this in Coldfusion (MX7).
alternativeitAsked:
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alternativeitAuthor Commented:
Perfect. Thanks! :)
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