正则表达式练习题

1.解析IP

namespace 解析IP
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "192.168.1.100[port=8080,type=ftp]";
            Match m1 = Regex.Match(str, @"\d{0,3}(\.\d{0,3}){3}");
            if (m1.Success)
            {
                Console.WriteLine("IP地址为{0}", m1.Value);
            }
            Match m2 = Regex.Match(str, @"port=(\d+)");
            if (m2.Success)
            {
                Console.WriteLine("端口为{0}", m2.Groups[1].Value);
            }
            Match m3 = Regex.Match(str, @"type=(\w+)");
            if (m3.Success)
            {
                Console.WriteLine("类型为{0}", m3.Groups[1].Value);
            }
            Console.ReadKey();
        }
    }
}

2.判断URL是否合法

namespace 判断URL是否合法
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "http://www.test.com/a.htm";
            Match m = Regex.Match(str, @"[a-zA-z]+://[^\s]*");
            if (m.Success)
            {
                Console.WriteLine("正确");
            }
            else
            {
                Console.WriteLine("错误");
            }
            Console.ReadKey();
        }
    }
}

3.判断日期是否合法

namespace 判断日期是否合法
{
    class Program
    {
        static void Main(string[] args)
        {
            string str="2012-12-21";
            Match m = Regex.Match(str, @"^\d{4}\-((0[1-9])|(1[0-2]))-((0[1-9])|(1[0-9])|(2[0-9])|(3[0-1]))$");
            if (m.Success)
            {
                Console.WriteLine("合法");
            }
            else
            {
                Console.WriteLine("非法");
            }
            Console.ReadKey();

        }
    }
}

4.匹配根目录下的文件夹

namespace 匹配根目录下的文件夹
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = @"C:\Windows\System32\myCmd.dll";
            MatchCollection ms = Regex.Matches(str, @"(\w+)\\");
            foreach (Match m in ms)
            {
                if (m.Success)
                {
                    Console.WriteLine("文件夹名字是{0}\t\r\n", m.Groups[1].Value);
                }
            }
            Match m1 = Regex.Match(str, @".+\\(.+)");
            if (m1.Success)
            {
                Console.WriteLine("文件名是{0}", m1.Groups[1].Value);
            }
            Console.ReadKey();
        }
    }
}

5.匹配国内电话号码

namespace 匹配国内电话号码
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine("请输入号码，区号请用-区分");
                string str = Console.ReadLine();
                Match m1 = Regex.Match(str, @"^\d{3}-\d{8}$|^\d{4}-\d{7}$");
                Match m2 = Regex.Match(str, @"^\d{11}$");
                Match m3 = Regex.Match(str, @"^\d{5}$");
                if (m1.Success)
                {
                    Console.WriteLine("你输入的是电话号码{0}", m1.Value);
                }
                else if (m2.Success)
                {
                    Console.WriteLine("你输入的是手机号码{0}", m2.Value);
                }
                else if (m3.Success)
                {
                    Console.WriteLine("你输入的是服务号码{0}", m3.Value);
                }
                else
                {
                    Console.WriteLine("输入错误");
                }
                Console.WriteLine();
            }
           Console.ReadKey();
        }
    }
}

6.匹配身份证号码

namespace 匹配身份证号码
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                Console.WriteLine("请输入号码");
                string ID= Console.ReadLine();
                Match m1 = Regex.Match(ID, @"^\d{15}$");
                Match m2=Regex.Match(ID,@"^\d{14}([0-9X]{4})$");
                if (m1.Success)
                {
                    Console.WriteLine("输入正确{0}",m1.Value);
                }
                else if (m2.Success)
                {
                    Console.WriteLine("输入正确{0}", m2.Value);
                }
                else
                {
                    Console.WriteLine("输入错误！");
                }
                Console.WriteLine();
            }
            Console.ReadKey();
        }
    }
}

7.提取数字

namespace 提取数字
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "hello,2010年10月10日是个好日子。恩，9494.吼吼！886.";
            MatchCollection ms = Regex.Matches(str, @"\d+");
            foreach (Match m in ms)
            {
                if (m.Success)
                {
                    Console.WriteLine("{0}\t\r\n", m.Value);
                }
            }
            Console.ReadKey();
        }
    }
}