Title: RSS feed: post-processing?


I've been puzzling over something but can't figure out a solution. I 
have an RSS feed providing the content behind all the links on this 
page: http://demo.plinkit.org/interestsideas/goodreads/booklists.

There's a nice bookmarklet tool in the world called LibraryLookup that 
lets you check whether a book you find on Amazon or something is in 
your library's catalog by scraping up the ISBN and launching an ISBN 
catalog search. It's a _javascript_, really. I thought I would adapt this 
to create a little add-on for the stuff the bestsellers RSS brings back 
to my site. What I need to do is pluck out the ISBNs in the links on a 
page like this one: 

The ISBNs are all in the URLs for the book titles 
("isbn=Some10digitNumberHere"). How would I look for a piece of text in 
that shape, i.e., isbn=5893193390, then, if it's there, copy and paste 
that piece of information into the LibraryLookup _javascript_ I have. The 
end result should be that, if there's an ISBN in a feed result, an extra link 
appears for each entry that says something like "Check the catalog," 
which you can click to look that book up in your own library's catalog.

I've been staring at the template that formats the RSS feed to figure 
out whether any TAL _expression_ would work for this. I've been playing 
with a short Python script, then wondering how to call it within that 
template, but I think I have to use regular expressions to do it.

I'm sorry to be so lost on this, but I guess I am. I'd love to do 
something cool like this for our little Plinkit libraries. Can anyone 
help? I'll take anything from a broad strategy to actual code snippets 
(I'm a terrible programmer but a good librarian).

Eva the Librarian

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