[chaley]

Originally Posted by ownedbycats

Additionally, something I forgot: logical-and is '&&.' What is a logical-or?

EDIT: Found it in the reference. ||

ANOTHER EDIT: In the Calibre search, it's possible to do something like this to find matches in both groups:

(title:foo AND author:bar) OR (title:bar AND author:bar)

if possible, how would the same thing be done in a template?

In an "if" in a template? More or less as you wrote it.

('foo' in $title && 'bar' in $author) || ('bar' in $title && 'bar' in $author)

Note that the expression can be simplified in both cases, removing the duplicate author check.

('foo' in $title || 'bar' in $title) && 'bar' in $author

(title:foo OR title:bar) AND author:bar

They both can be further simplified using regular expressions.

'foo|bar' in $title && 'bar' in $author

title:~foo|bar AND author:bar