Moving "feat. X" from 'Artist' to 'Title'

So right now I have a lot of songs that have the featured artist in the Artist column. Example:

Artist: Dr Dre feat. Eminem
Title: Forgot About Dre

I want it to look like this:

Artist: Dr Dre
title: Forgot About Dre feat. Eminem

I did some searching on these forums and found that I should do the following:

Action: Guess values
Source format: %title% $regexp(%artist%,(.) Feat. (.),'('Feat. $2')' +++ $1)
Guessing pattern: %title% +++ %artist%

I've done this several times now and it fails every time. Am I doing something wrong?

Action: Guess values
Source format: %title% $regexp(%artist%,'(.) feat. (.)','feat. $2 +++ $1',1)
Guessing pattern: %title% +++ %artist%

Thanks, brofessor. This worked immediately!