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I'm mostly clueless about regex, but as a suggestion, try typing something like
author:"~"
in the library search bar to filter your collection to the subset you want, CTRL-A to select all of them, then go to
Edit Metadata > Edit Metadata in Bulk > Search and Replace
select "Regular Expression" as the Search Mode at the right and try your regex there.
Make some kind of backup before you try anything.
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