Arguments

start

   Specifies the offset of the starting character of the string
   you want to extract. Specify the start argument as an integer
   expression that is greater than or equal to zero.

   The offset is the relative position of a character or a substring
   with respect to the beginning of the string. Offset positions
   begin with zero. The string always begins with the leftmost
   character.

   If you specify an offset that is greater than or equal to the
   length of the string, F$EXTRACT returns a null string ("").


length

   Specifies the number of characters you want to extract; must be
   less than or equal to the size of the string. Specify the length
   as an integer expression that is greater than or equal to zero.

   If you specify a length that exceeds the number of characters
   from the offset to the end of the string, the F$EXTRACT function
   returns the characters from the offset through the end of the
   string.


string

   Specifies the character string to be edited. Specify the string
   as a character string expression.