The Swap method can swap two parts of a filename divided by a separator. The method can be useful when you want to change "Michael Jackson - Thriller.mp3" to "Thriller - Michael Jackson.mp3".
The separator used to divide the two parts of the filename. Everything on either side will get swapped.
If the separator exists more than once in the filename you can use this control to define which occurence of the divider to use when swapping.