an example can be found on AMOSPro_Examples:Examples/H-0/Help_2.AMOS
Searches out the occurrences of a string INside another STRing. The result is the location of the first character in your destination string, starting from the left.
If search has been unsuccessful, you`ll get zero.
test=Instr("source string","search characters")
Print Instr("AMOS Professional","AMOS")
You can also start off the search from a specific position, using an optional start parameter.
test=Instr("source string","search characters",start)