Remove redundant artist information

[Roland]

In some songs I have redundant artist information that I would like to correct.
For example

> Victoria Monét, Earth, Wind & Fire, Hazel Monét; Earth, Wind & Fire & Hazel Monét
Earth, Wind & Fire, Hazel Monét; Earth, Wind & Fire

What I like to get is
> Victoria Monét; Earth, Wind & Fire; Hazel Monét
Earth, Wind & Fire, Hazel Monét

How can I correct this and similar with an rule based action (i.e. REPLACE)?
Best would be an action that identifies and corrects redundant artist information in general.

[GeorgeW]

For this pattern, there is a very simple solution, but may not suit all your examples. I learnt about Guess values the other day!

Action Guess values
Source format %title%
Guessing pattern %title%; %dummy%

This gives you everything before the ; and discards (via %dummy%) from the ;

[LyricsLover]

@GeorgeW

This gives you everything before the ; and discards (via %dummy%) from the ;

This is basically true but does not check in any way if the part after the ; is the same as the part in front of the ;
The OP only wants to remove redundant (identical) information that occurs twice.

[LyricsLover]

What about this answer:

COPYRIGHT - eliminate redundancy

In the COPYRIGHT field I often find strings like 2023 Blues Route / Delta 2023 Blues Route / Delta The texts contain a different even number of words. I would like to eliminate the obvious redundancy in the text. After correction, I would like to get the following: > 2023 Blues Route / Delta How to do this?

and this answer

Minimize redundant information

There is redundant information in many of my albums. I can correct a lot of this with rule-based macros. I like to have INVOLVEDPEOPLE as preferred information. PERFORMER often contains redundant information. [TAG Dubletten] How should a check or reformatting for the attached example be formulated? Can it also include PRODUCER?

[Roland]

I found a way to solve this!
I divide the tag into multiple tag occurrences and use the function REMOVE DOUBLE ENTRIES.