newbie: searching for web links in text

Hello,

I apologize for the stupid newbie question, but I have
a problem...

I want to search a block of text in an XML document,
and if there is a http:// ... or a www. ... string, to
grab it and convert it into an HTML link in a
transformation.

The XML document looks like this:

...
<P> (blah blah blah) goto, www.cnn.com for more news.
</P>
<P> (blah blah blah) also see http://www.msnbc.com.
</P>

and so on.

thanks

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