[*]Profan

s1: String - the To bearbeitende String
n : worth - Start the Search
s2: String - Suchtext
s3: String - Ersatztest
D : String - Separator (Delimiter)

If no Separator indicated is:
any Vorkommen the Strings s2 go in s1 ex the position n through s3 supplant.
If one Separator indicated is:
any Vorkommen the Strings s2 go in the Teilstring n the Strings s1 through s3 supplant.