[chaley]

Originally Posted by MarjaE

In the search bar at the top of the Calibre window.

And I tried OR first. B OR C works. A (B OR C) turns red.

FWIW and apologies for the late reply: the implied "and" doesn't currently work when using parentheses. The "and" must be explicit, as in

A and (B or C)

I will fix this.

And again FWIW: note that "and" takes precedence over "or", meaning that

A B C D E or F

is parsed as

(A and B and C and D and E) or F

*not*

(A and B and C and D) and (E or F)

BetterRed has it right: use parentheses to be sure you get what you are asking for.

EDIT: Fix will be in the next calibre release (3.23)