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 MID$(stringexpression$, start% [,length%])
 MID$(stringvariable$, start% [,length%]) = stringexpression$
 
 Usage Notes
   ■ The arguments start% and length% must be numeric expressions between
     1 and 32,767, inclusive.
 
   ■ If length% is omitted from the MID$ function or if there are fewer than
     length% characters in the string (including the start character), the
     MID$ function returns all characters from the position start% to the end
     of the string.
 
   ■ The optional length% refers to the number of characters from the
     argument stringexpression$ that are used in the replacement. If length%
     is omitted from the MID$ statement, all of stringexpression$ is used.
     However, regardless of whether length% is omitted or included, the
     replacement of characters never goes beyond the original length of
     stringvariable$.
 
   ■ If start% is greater than the number of characters in stringexpression$,
     MID$ returns a null string.
 
   ■ Use the LEN function to find the number of characters in
     stringexpression$. See: ◄LEN Function►