equalsIgnoreCase() is similar to equals() but is not case sensitive. It is used to compare the current string to another string value. The method returns an integer value, which is 1 (TRUE) if the compared values are equal and 0 (FALSE) if not:
DEFINE city, cust_city STRING
DEFINE equa INT
...
LET equa = cust_city.EqualsIgnoreCase(city)