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 INSTR([start%,] stringexpression1$, stringexpression2$)
 
 Usage Notes
   ■ The arguments stringexpression1$ and stringexpression2$ can be string
     variables, string expressions, or string literals.
 
   ■ Use the LEN function to find the length of stringexpression1$.
     See: ◄LEN Function►
 
   ■ The value returned by INSTR depends on the following conditions:
 
     Condition                           Return Value
     ══════════════════════════════════  ═══════════════════════════════════
     stringexpression2$ found in         Position at which the match is found
     stringexpression1$
 
     start% greater than length of       0
     stringexpression1$
 
     stringexpression1$ is null string   0
 
     stringexpression2$ cannot be found  0
 
     stringexpression2$ is null string   start% (if given); otherwise, 1