Filtering plugins
http://azureus.sourceforge.net/plugi...plugin=rssfeed
http://projects.radgeek.com/feedwordpress/
filtering from working. In FeedWordPress, you can (1) apply certain categories to all syndicated posts, or all posts from a particular feed; and (2) filter out all posts that don?t match one of the categories that are already in the WordPress database
If you are trying to filter words out you could try
http://wiki.wordpress.org/Plugin/API...from=PluginAPI
http://www.feedshake.com/
When in doubt check wordpress.org or
http://wiki.wordpress.org/
Anything you can think of almost is already out there FREE. Also you can learn to write your own plugins by going here
http://codex.wordpress.org/Writing_a_Plugin