C#的正则表达式

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text.RegularExpressions;

namespace codeTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] strArray = { "1111-222-333", "1111-2222-3333" };
            string pattern = @"^\d{4}-\d{3}-\d{3}$";

            foreach (var item in strArray)
            {
                if (Regex.IsMatch(item, pattern))
                {
                    Console.WriteLine("{0} is vaild", item);
                }
                else
                {
                    Console.WriteLine("{0} is not vaild", item);
                }
            }
            RegexIsMacth();
            RegexReplace();
            RegexSplit();
            RegexMacths();
            RegexGroup();
            Console.ReadLine();
        }

        static void RegexIsMacth()
        {
            string input = " this is my name my name";
            string pattern = @"\s\w{4}\s";
            Match match = Regex.Match(input,pattern);
            while(match.Success)
            {
                Console.WriteLine(match.Groups[0].Value);
                match = match.NextMatch();
            }
        }

        static void RegexReplace()
        {
            string input = " this is my name my name";
            string pattern = @"\s\w{4}\s";
            string replacement = " 匹配 ";
            Console.WriteLine(input);
            Console.WriteLine(Regex.Replace(input, pattern, replacement));
        }

        static void RegexSplit()
        {
            string input = "1.A 2.B 3.C 4.D ";
            string pattern = @"\s";
            foreach (var item in Regex.Split(input,pattern))
            {
                if (!string.IsNullOrEmpty(item))
                {
                    Console.WriteLine(item);
                }
            }
        }

        static void RegexMacths()
        {
            Regex regex = new Regex(@"\d+");
            MatchCollection matchs;
            matchs = regex.Matches("123abc333adsa123123asdasd123123");
            foreach (Match item in matchs)
            {
                Console.WriteLine("value is {0},index is {1}",
                    item.Value,item.Index);
                Console.WriteLine("Result is {0}",item.Result("[$&]"));
            }
        }

        static void RegexGroup()
        {
            string input = "born: July 28, 1989";
            string pattern = @"\b(\w+)\s(\d{1,2}),\s(\d{4})\b";
            Match match = Regex.Match(input, pattern);
            for (int i = 0; i < match.Groups.Count; i++)
            {
                Console.WriteLine("Group value is {0},index is {1}",match.Groups[i].Value,match.Groups[i].Index);
            }
        }
    }

}

推荐使用微软的Regular Expression Tester工具测试