string t_val = "***2011/05/01\r\naaa\r\n***2011/05/07\r\nbbb\r\n***2011/06/09\r\nccc";
                Regex reg = new Regex(@"(\*\*\*\d{4}?/\d{2}/\d{2})\r\n(?<Text>[\s\S].*)");
                Match mt = reg.Match(t_val);
                while (mt.Success)
                {
                    Response.Write(mt.Groups["Text"].Value +"<br/>**********************<br/>");
                    mt = mt.NextMatch();
                }