First of all, thank you for powerful tool !
Unfortunately, I have to unwind a tag which I have composed with the help of MP3Tag. The field currently contains the expression "composer - title" (title means Opus in this case). Therefore, I am looking for the definition of an action which deletes all strings up to the last blank before 'title', in this example to delete "composer - ". The composer represents the name, therefore the number of strings to be deleted will vary.
How can I manage to get that working ? Please note that I am not familiar with defining actions.
Thank you for your help in advance !