Retrieve the right n characters from a string in Design Studio

Greeting,

I would like to know how to retrieve the rightmost n characters from a string.

Example:

I have a string that contains value '1/1/21 ' . I need to get 21 from the string. I cant use substring with offset since I the length of the string is not fixed ...it changes like 21/12/19. In this case I need to get 19.

How do we accomplis this in Design studio ? Can I get this with split function ?

Thanks.