bas7advr.hlp (Topic list)
MID$ Statement Details
  Syntax  Details  Example                 Contents  Index  Back
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MID$ replaces a portion of a string variable with another string.
 
MID$(stringvariable$,start%[,length%])=stringexpression$
    ■ The arguments start% and length% are numeric expressions.
    ■ The argument stringvariable$ is a string variable.
    ■ The argument stringexpression$ can be a string variable,
      string constant, or string expression.
 
Usage Notes
    ■ 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$.