1 INSTR
 The INSTR function searches for a substring within a string,  and  returns
 the position of the substring's starting character.

 Example

 Y% = INSTR(1%, Alpha$, "JKLMN")

2 Syntax

     int-var = INSTR(int-exp, str-exp1, str-exp2)

 The search begins at the location specified by int-exp, looking for  the
 first occurrence of str-exp2 in str-exp1.