I just tested quickly, i believe you should be able to do that.
Here is what i did.
Created Filter with two setfield actions.
Here is the test result.
Please let us know if my understanding is wrong? Also you can use the AR API Filter plug-in Regular Expression (Regex) AR API Filter Plug-in (v4.1) and use the regexp to strip it down as well.
Mohammad, this is fantastic! Thank you VERY much!