Extract artist from existing field

Hi, I have a similar problem but this string does not function.
I have this tag in the field "Artist"
Composer [Artist]

I need to delete the "Composer"s words and to leave [Artist]...probably the problem is [
Could you help me please?

In an action of the type "Guess value" for %artist%
the pattern: %composer% [%artist%]
should work.

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Many thanks.