Retrieves a substring.
Syntax
strsub(string, start [, length])
Remarks
If the start index is a negative value then the substring is returned start characters from the end of the string rather than from the beginning.
Example
A function to reverse a string.
.function rev(s) rev = "" .for i = 1, i <= strlength(s), ++i rev += strsub(s, -i, 1) .loop .endfunction ; Displays "Hello!" .echoln rev("!olleH")