[Slice of Life]

I'm looking for a Linux based or platform independent open source tool that monitors RSS feeds for me. It should do the following:

Take a list of RSS feeds given by the user, look them up every xxx minutes (individual, user-defined time intervals), match the entries against a list of patterns (both a global list and individual lists) and perform an action depending on the feed and the pattern matched (in particular: store them into a file, put them into a e-mail report sent every yyy hours, inform the user immediately, or simply ignore them.) The tool should run standalone and be configurable with config files and the command line alone.

This is a task so basic I thought there *must* be a tool and probably with more options than I can think of. But it seems I lacking the correct magic words for google. I have a perl script that does a the bare minimum of these tricks but I don't want to reinvent the wheel.