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procedure TForm2.Edit1Change(Sender: TObject);
var
  str:string;
  i:integer;
begin
  str:='';
  str:=Edit1.Text;
  if (Length(str)>0) then
  if (not((str[Length(str)])in['0'..'9','A'..'Z',#8]))or(Length(str)>6) then
  begin
    Edit1.Text:=LeftStr(Str,Length(str)-1);
  end;
  Edit1.SelStart:=Length(Edit1.Text);
  if Length(str)>=6 then
  Edit2.SetFocus;
end;
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str:=Edit1.Text ;

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str := TEdit(sender).Text;



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interface
type
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