Rss reader with keyword filter wanted

Hey everyone,

first of all I want to say HI to everyone, just joined the forum!
I am searching for a wordpress plugin that reads feeds but does only post feed entries with a certain keyword to my wordpress blog.
Like for a website for BMW cars, I would like to add an rss feed about the automobile industry, but only feeds with the word “BMW” in it should be automatically posted to the website. This is just an example though.

I have already installed a lot of rss readers, but I could not find this option in any of them. I am starting to believe that there is no WordPress feed reader plugin with this option… any Ideas?

Thanks!