Automatiucally switch [first name] [last name] by script?

[DetlevD]

@deus62

...

1. In the artist tag field I have the following name: Marv[space]Johnson
2. I want to automatically, somehow, change this into: Johnson[comma][space]Marv
   ...
   Is this at all possible?

To answer your question: Yes.
Read there:
Regular Expressions

DD.20090902.2232.CEST