Plugin/hooks for simple content & title modifcations

Perhaps a plugin already exists to do what I need, if so I would appreciate being directed to it.

I’m experimenting with posting to a wordpress blog via the email submission engine. It’s an intriguing feature and I like it, but some of the programmatic methods I use to post content, include content I don’t want posted to the blog. Could be ads in the footer, certain words in the title, etc.

I would like to be able to define certain strings of content that, if found in either the title or body of the post, are stripped out.

I know in principal how to do this, it would basically require a little regex and accessing the title & content hooks to modify the content before it is written to the DB. Unfortunately I am new to WP plugin development and I suspect it will take me a long time to figure this out, and I may be reinventing the wheel.

Does this already exist, or can anyone point me in the right direction for how to do it more quickly than my own experimenting?

Thanks all!

Jonathan