string strTest= "www.BaiDu.com",strRst="";

            //忽略大小写，将strTest中的BaiDu替换为baidu

            Regex myRegex = new Regex("baidu",RegexOptions.IgnoreCase);

            strRst=myRegex.Replace(strTest,"baidu");

            Console.WriteLine("\n替换前的字符串为:"+strTest);

            Console.WriteLine("\n替换后的字符串为:"+strRst);

            Console.WriteLine();

            Console.WriteLine(The_Day.getTheDay()+" By yxHuang!...");

            //暂停，用于查看效果

            Console.Read();