Hi Garrett,

Finally you have comprised my spirit. Thanks.

I have put an example with a character, where the construction of a matching sequential machine is not necessary.

For 2 or more characters the comparison between OCCURS() and AT() depends on the type of strings,

because:

OCCURS() it counts all the contained strings, without superimposition

? OCCURS('AA','AAAAA')  && return 2

AT() it search the position of the contained strings, with superimposition

? AT('AA','AAAAA',1)    && return 1
? AT('AA','AAAAA',2)    && return 2
? AT('AA','AAAAA',3)    && return 3   <--- exist the 3° occurrence
? AT('AA','AAAAA',4)    && return 4   <--- exist the 4° occurrence
? AT('AA','AAAAA',5)    && return 0

Fabio