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INSTR - a string processing function that returns the character
        position of the first occurrence of a string in another string
 
Syntax
  INSTR([start,]stringexpression1,stringexpression2)
    ■ stringexpression1 is the string to be searched
    ■ stringexpression2 is the string to look for
    ■ If the optional start argument is used to begin the search beyond the
      first character of stringexpression1, it must be a numeric-expression
      with an integer value between 1 and 32,767.