Filter with more than 1 argument + check on empty field

[irinaonline]

-if "($SupplementalCategories =~ /%%~nf/i)"

works fine, however, I would like to extend my filter to

-if "(NOT $CountryCode) and ($SupplementalCategories =~ /%%~nf/i)"

this does not work. what is the correct syntax to get only a result back, where the CountryCode is NOT filled?

[Phil Harvey]

"NOT" should be lower case.

- Phil

[irinaonline]

ty