MID$ Statement Details
 
Syntax
  MID$(stringvariable,start[,length])=stringexpression
 
  Argument           Description
  stringvariable     The string variable being modified.
  start              A numeric expression giving the position in
                     stringvariable where the replacement starts.
  length             The length of the string being replaced. The
                     length is a numeric expression.
  stringexpression   The string expression that replaces part of the
                     stringvariable.
 
The arguments start and length are integer expressions. The argument
stringvariable is a string variable, but stringexpression can be a
string variable, string constant, or string expression.
 
The optional length refers to the number of characters from the
argument stringexpression that are used in the replacement. If length
is omitted, 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.