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  Arguments
 
    substring    String expression to be located
 
    source       String expression to be searched
 
  Returns
 
    Byte         Position within source of first character of
                 substring, or 0 if substring is not in source
 
  Description
 
    The Pos function looks for a substring pattern within a string. If
    the string contains the substring, Pos returns an integer value
    giving the starting position of the substring within the source
    string. If Pos does not find the substring in the source string,
    it returns a zero.
 
      Example Call        Return
      ════════════════    ══════
      Pos( 'B', 'ABC')    2
      Pos( 'B', 'abc')    0