C#用正则表达式对IP进行排序

static void Main(string[] args)  
{  
    string IPs = "   192.168.1.1   202.47.4.6      1.2.3.3   ";  
    Console.WriteLine(IPs);  
    IPs = Regex.Replace(IPs, @"(d+)", "00$1");//先给每个IP的数字加上00  
    Console.WriteLine(IPs);  
    IPs = Regex.Replace(IPs, @"0*(d{3})", "$1");//然后将每个数字用它的后3位替换  
    Console.WriteLine(IPs);  
  
    string[] IParr = Regex.Split(IPs, @" +");  
    List<string> listIP = new List<string>();  
    foreach(string ip in IParr)  
    {  
        listIP.Add(ip);  
    }  
    listIP.Sort();//直接调用List的Sort方法进行排序  
  
    foreach(string ip in listIP)  
    {  
        Console.WriteLine(Regex.Replace(ip,@"0*(d+)","$1"));  
    }  
  
    Console.ReadKey();  
}  

　　转载地址：http://blog.csdn.net/frombegintoend/article/details/9228909