Substitute-func
Substitute find$ with sub$ when found in within$.
string Substitute(string within$, string sub$, string find$[, int n = 0])$
within
sub
find
n
Return the new string replaced find$ by sub$ in within$.
string new$=Substitute("abcdefabcdef",12,bcd,0)$; new$=; //Should return a new string: "a12efa12ef".
Replace, Exact