Hi All, I have two strings: S1="A,,C,D" and S2="A,B,,D" I do string:tokens(S1) : "A","C","D" length =3 I do string:tokens(S2) : "A","B","D" length = 3 Imagine the string S = S1 or S2 How can I know if B is absent or C ? It is a general question of course ! the tokens function cannot separate the tokens with a composite string unfortunately (here ",,")