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procedure TForm1.Button1Click(Sender: TObject);
begin
  if OpenDialog1.Execute
    then Memo1.Lines.LoadFromFile(OpenDialog1.FileName);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  find: string;
  text: string;
  st, len: integer;
  res: integer;
begin
  if Memo1.SelStart >= Length(Memo1.Text) then Memo1.SelStart := 0;
  st := Memo1.SelStart + 1;
  if (Memo1.SelLength <= 0) or (not CheckBox1.Checked) then begin
    inc(st, Memo1.SelLength);
    len := Length(Memo1.Text) - st;
  end else
    len := Memo1.SelLength;
  text := copy(Memo1.Text, st, len);
  find := Edit1.Text;
  res := pos(find, text);
  if res = 0 then begin
    ShowMessage('Search string "' + find + '" not found');
    Exit;
  end;
  Memo1.SelStart := res + st - 2;
  Memo1.SelLength := length(find);
end;