Reversing complex group-artist mp3 naming

[mrvelous01]

Hello. I'm relatively new to regular expressions and have taken a few shots at this, but can't seem to get it right. I have also reviewed the posts on this forum but did not find any examples that really applied.

I have several dozen files (mp3's) that have the format "song title - the artist name.mp3" and I want to rename them "artist name - song title.mp3". The primary problem I have with capturing the individual expressions is that the song title and the artist names vary with the number of words before and after the hyphen. Here are a few examples. Thanks in advance for your help.

From:
Tenessee Christmas - Alabama.mp3
25 Or 6 To 4-Chicago.mp3

To:
Alabama-Tenessee Christmas.mp3
Chicago-25 Or 6 To 4.mp3

[mrvelous01]

Sorry, the title of the posting should have been "Reversing complex title-artist mp3 naming

[GMA]

Hi, mrvelous01:
This is what you need:

1. Set RegEx (1) as:
MATCH: (.*?)-(.*)
REPLACE: \2 - \1

2. In the Remove (5) field, check "Trim" (that'll remove any spaces left at the beginning of the file name).

3. Use the preview to see if everything's OK, and then press "Rename".

One thing; if there's no space before/after the hyphen (e.g.: "Title-Artist") it will be added as a result of the renaming process (e.g.: "Artist - Title"), which may or may not be a problem for you. If that IS a problem, then you're gonna have to use two different RegExs.
Cheers,

Gabriel.