Nope.
Suppose $numtok(<string>,46) returns 5. That means there are 5 dot delimited tokens.
You are doing $calc($numtok(<string>,46) - 2), which gives 3, which means you'll reference the third token starting from the beginning.
$gettok(<string>,-3,46) references the third string starting from the back.
Riddle me this, riddle me that, where's the -3 token at?
a.b.c.d.e
-1 = e
-2 = d
-3 = c
1 = a
2 = b
3 = c
Suppose $numtok was 6 -> 6-2 = 4, 4th token from the beginning, is the 3rd token from the back.
Etc.
