procedure TForm1.RichEdit1Change(Sender: TObject);
var i:integer;
begin
i:=pos('GOOD',RichEdit1.Lines.Text);
if i=0 then exit;
RichEdit1.SelStart:=i-1;
RichEdit1.SelLength:=length('GOOD');
SendMessage(RichEdit1.Handle,EM_REPLACESEL,0,INTEGER(PCHAR('好的')));
end;