I'm trying to create a button that sends the details of the referring page (ie. a blog post) with an RSS url. I have it working in PHP to collect the data as a HTML url but this is no help to me as I need to MATCH it against an RSS link. Any pointers on how I could go about trying to achieve this; As an example, this is what I get: http://www.example.com/2008/this_is_a_great_post.html and what I want to retrieve; http://feeds.feedburner.com/~r/Example/~3/153/2008/this_is_a_great_post Hope this helps.