日期:2014-05-18 浏览次数:20967 次
            string s = "123:234;321:123;789:987;";
            Match m = Regex.Match(s, @"321:(\d+)");
            Console.WriteLine(m.Groups[1]);
------解决方案--------------------
string result = Regex.Match(yourStr,@"(?<=321:)\d+").Value;
------解决方案--------------------
string pattern=@"^\d{3}:\d+$";