Discussed in Q&A, because this is a FAQ.

Update: Caveat: depending on how "strictly" you are speaking, output which included everything in f2.txt ... or everything other than the bare name "Matt" (but including the modifiers to "Matt" in f2) could also be a correct answer.

Also, since this smells strongly of 'homework', please note that we like to have such questions so labeled if that's the case.