Currently JMP's Words() function will split by any characters found from delimiters. Add a flag parameter which would allow user to use the delimiter string as one instead of any
Names Default To Here(1);
str1 = "a.,b.,c,d"; // last value should be c,d
//Show(Items(str1, ".,"));
Show(Words(str1, ".,"));
Most likely same feature could be added to Word(), Item() and Items() as they perform similar operations.