Thanks. I looked for that before, without any luck. Live and learn.
http://manual.calibre-ebook.com/gui.html#search-sort
Quote:
You can search for the number of items in multiple-valued fields such as tags. These searches begin with the character #, then use the same syntax as numeric fields. For example, to find all books with more than 4 tags use tags:#>4. To find all books with exactly 10 tags use tags:#=10.
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