Quote:
Originally Posted by chaley
You can do this using global search and replace, with "template* as the input field. The template will be "{authors}" (no quotes). Use regular expressions to remove everything after the first &. I'm not near a computer so I can't show you any more about how to do it.
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Any day I learn a new Calibre feature is a good day!
Just to expand on this for anybody else who, like me, might need some help finding the global search and replace: select all of the books you wish to edit (in OP's case, all books), and
Edit metadata in bulk. One of the tabs in the resulting window is for
Search and replace. Remember, Calibre cannot undo this step without a backup of your database from before the edit, so you should consider taking the time to create such a backup before you make your edits.
Oh, and +1 for theducks' suggestion too!