[Radiant] How to use regex with if_url tag!

[Arik Jones]

<r:if_url matches="^.*\b(podcast|podcasts|audio|media)\b.*$">

### some reference to an audio file here ###

</r:if_url>

Essentially what the regular expression above does is show the content
only if the url contains any of the following words. So in the example
if I'm running a podcast (using page_attachments to upload audio files)
I can show the audio url ONLY within the context of the url keywords
described in the regexp and you can add as many keywords as you'd like.
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