Hi all!
I'd like to do a template search for """book_producer""" containing "^calibre" with (formats:#=1 and formats: pdf). As shown in Calibre manual, that publication metadata field is available:
This thread provides some examples (
https://www.mobileread.com/forums/sh...d.php?t=347884) however i couldn't figure how to do write that query.
Screenshot below shows what I tried, but that was just guesswork:

Any help is appreciated.