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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)