How do I automatically search for blacklisted words?

Hi,

Is there a module avaiable that will allow me to automatically search newly submitted comments for certain blacklisted words (e.g. swear words)? The idea system would work something like this:

Every hour, the module would search all the newly submitted comments for blacklisted words. It then creates a list of all the offending comments. Forum moderators will check this list as frequently as they can, read the offending comments and decide what the best course of action is.

(Incidentally, we do not want a system that automatically sensors posts. We feel that's patronising and cold.)

Is anyone aware of a module that does what we want? If not, I'll write one for Drupal 4.7.

Thanks,
Jack