If would like Calibre to display all records with a custom field different from a given resulst, i.e. a Boolean NOT.
I have
working as expected. How would I search for fields other than foo? For a single letter a regular expression might work, something like
PHP Code:
#my_field:"~[^X]"
but for a string?
Is there an easy way to tell Calibre to display #my_field except if it contains "foo"?