Filter with Regular Expression (Regex)
Track numbers that have number/number syntax
track MATCHES \d\/\d
Filenames that start with two digits:
%_filename% MATCHES ^\d\d
Filenames that start with two digits not followed by another digit:
%_filename% MATCHES ^\d\d\D
Case sensitive filter:
title MATCHES (?-i)regex
Files with characters that are not in ISO-8859-1 in tag or filename
* MATCHES [\x{0100}-\x{FFFF}]