Multiple value artist tag to multiple value artistsort

Is there a way how I can do this:

ARTIST: John Lewis:Mick Jagger;Ringo Harrison


ARTISTSORT: Lewis, John;Jagger, Mick;Harrison, Ringo

I have found (and used it) solution how to make this if I have only one artist in ARTIST tag, but how can I do it if there's more than one artist in that tag?

Action type: Format value
Format string: %artist%

Action type: Replace with regular expression
Regular expression: ([^;]+)\s([^;]+)
Replace matches with: $2, $1

Dano, thank you very much!