Syntax:     RHT(str,cnt)

Defn: A CI evaluator function that performs right string
extraction. When cnt is positive, the rightmost cnt
characters are extracted from str. When cnt is
negative, the string that is extracted begins at
the index of the absolute value of cnt.

Type: String

Example: rht("abc",2)
Result: bc

Example: rht('abcdefg',-3)
Result: cdefg