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You can match three groups of text, each separated by " - ". That way the actual contents of the groups can be ignored. Just match everything. A little dangerous because it can match titles you don't want to match. Be careful. Make sure you hava a backup and know how to restore it.
^ makes sure the match starts at the first character. Not really needed here, but makes it a little safer to avoid surprises.
.+ means match any sequence of chars, 1 long or longer.
So the pattern could be:
^(.+)\s-\s(.+)\s-\s(.+)
Replace with just the third group:
\3
Actually this would also work:
^(.+)\s-\s(.+)\s-\s
Replace with nothing. The parts that match are deleted.
Or this:
^overworld\s-\s.+\s-\s
Replace with nothing. A little safer, will only work on books with a title that starts with "overworld". Groups are not needed since you don't intend to reference any.
So the pattern could also be:
^.+\s-\s.+\s-\s(.+)
Replace with just the only group:
\1
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