Is it possible to make a small tweak to the RSS importer to filter out URLs of certain websites or any other information. I'm looking at the rss_import and magpierss files, but it's a little above my comprehension level to be able to filter out stuff.

Ideally it would be nice to have a small addition to the code that allowed people to filter out feed items by URL or keyword. Is this possible?

Thanks to anybody that can assist!