 
      
      findlast()Find the position of the last occurrence of a substring in a string
findlast(s, search, start_pos = (length(s)-1))
s (string)  — A stringsearch (string)  — A string to search forstart_pos (number, optional)  — Where to begin the search. The default value is length(s) - 1 (at the end of s)
number — Returns the position of the first character of the last match. Returns -1 if no matches were found
findlast("Hello World", "o")      ' Returns 7
findlast("Hello World", "o", 6)   ' Returns 4
findlast("Hello World", "o", 2)   ' Returns -1