string last index of any in ruby

Code in Ruby to find the last index in a string of any char in a sequence of chars. ???'? ?????? ?? ????????? ??? ????? ??? ???? ??????! Download source code at: https://drive.google.com/file/d/1c99HDroAqoIo5O28nVr2H3XE020z_2Ta/ Like and share. It's FREE too :) Follow us on Facebook https://www.facebook.com/AllTech-1089946481026048/