string tempStr = File.ReadAllText(@"C:\Users\M\Desktop\Test.txt", Encoding.GetEncoding("GB2312"));
            string pattern = @"(-+?)[^-]+?\1[^-]*(?=\s|$)";        
            foreach (Match m in Regex.Matches(tempStr, pattern))
            {
                string result = m.Value;//循环输出
                

            }