^hes asking as a general use, although hes given an example of using google.
more like hes asking if its possible to have filter options on all search engines.
No, he's asking if you can filter RSS feeds using regular expressions. Like you can filter Google searches.
The answer to which is, I don't know, but it's very possible that whatever client you use to read them will have some kind of tool for sorting messages into particular folders, especially if it's a full-fledged mail client like Thunderbird or something. In which case, my advice would be to use that.
EDIT: Just checked, and Thunderbird has a pretty good system for filtering messages. You have to be careful and include the particular site you want to run it on in the filter though (or move that feed to a folder of its own), since it applies them folder-wide, and not per feed. That's easily done though.
