My bad. It actually works quite well (as you already concluded).
I've created a new test-database with some typical examples and all went well this time.
It might have been an issue with the author sorting or maybe the localized language set of my previous testdatabase.
Great thing is that the script also helps me cleaning up titles containing strings from the author or serie field.
So great thanks for this. You've given me significant quality time back.
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