FROM:
Song - Artist.mp3
Song Title - Artist.mp3
Song Title - Artist name.mp3
TO:
Artist - Song.mp3
Artist - Song Title.mp3
Artist name - Song Title.mp3
Rule:
Match everything till an space-hyphen-space and store it in ()-group 1,
then match the rest till the extension and store it in group 2.
At the replacement reorder the stored matches and reference to group 2 first by using \2,
then add an hyphen literally your self and add \1 to 'paste' what was matched in group 1.
DO:
RegEx(1)
Search: (.+) - (.+)
Replace: \2 - \1
"[ ] Include Ext." is unchecked.
"Options > Ignore... > File Extensions" is unchecked.
Select a few files in the Name column to see what happens in the NewName column.
.