Class

The Class operation consumes one character and tests it against a character class from the class data section. The argument is the index (decimal integer or hexadecimal offset) at which position the class definition is stored.

; Class example: match character class at index 0

CLASS 0
MATCH

Syntax

If you prefix the operation with the Not modifier, it negates it’s meaning. If you combine the operation with the CI modifier, the characters in the sequence are compared using case-folding. For a case-folded comparison, the characters in the class must be case-folded.

CLASS <class index>
NOT CLASS <class index>
CI CLASS <class index>
NOT CI CLASS <class index>