How to use string.Endswith to test for multiple endings?

Question

I need to check in string.Endswith(\"\") from any of the following operators: +,-,*,/

If I have 20 operators I don\'t want to use ||<

Answer 1

Using String.IndexOf(String):

str.Lenght > 0 ? "+-*/".IndexOf(str[str.Lenght - 1]) != -1 : false