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- (* line comment *)
- rule = [optional] , symbol , { letters } , ( digit | symbol ) ;
- optional = ? something unnecessary ? ; (* trailing comment *)
- symbol = '!' | '@' | '#' | '$' | '%' | '&' | '*' ;
- digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
- letter = "A" | "B" | "C" | "D" | "E" | "F" | "G"
- | "H" | "I" | "J" | "K" | "L" | "M" | "N"
- | "O" | "P" | "Q" | "R" | "S" | "T" | "U"
- | "V" | "W" | "X" | "Y" | "Z" ;
|
