str: "abcdefgh"
n: 2
m: 3

; starting from n=2 characters in and m=3 in length
print slice str n-1 n+m-2

; starting from n characters in, up to the end of the string
print slice str n-1 (size str)-1

; whole string minus last character
print slice str 0 (size str)-2

; starting from a known character char="d"
; within the string and of m length
print slice str index str "d" m+(index str "d")-1

; starting from a known substring chars="cd"
; within the string and of m length
print slice str index str "cd" m+(index str "cd")-1