正则表达式学习笔记3-练习

输入一个IP地址，通过正则表达式来判断输入的IP地址（A.A.A.A，A是0-255之间，4个A不一定相同）是否符合格式规则。

Console.Write("Input: ");string s = Console.ReadLine();string pattern = @"^(((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|(\d))\.){3}((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]\d)|(\d))$";bool isMatch = Regex.IsMatch(s, pattern);Console.WriteLine("Result: {0}\n", isMatch);