Mã:
using System;using System.Text.RegularExpressions; class ChuongTrinh{     static void Main()    {        string chuoi = "Mot, Hai, Ba, Trung Tam Dao Tao Cong Nghe Thong Tin";        Console.WriteLine("\""+chuoi+"\"");         Console.WriteLine("Cat chuoi dua vao 1 ky tu hay 1 chuoi phan cach: ");        Regex quytac = new Regex(", ");        foreach (string str in quytac.Split(chuoi))        {            Console.Write(str+"
");        }         chuoi = "Mot Hai Ba ";        Console.WriteLine("
\"" + chuoi + "\"");        Console.WriteLine("Tim chuoi dua vao toan hoc:");        quytac = new Regex(@"(\S+)");        foreach (Match math in quytac.Matches(chuoi))        {            Console.Write("Chuoi: "+math.ToString()+" co chieu dai la "+math.Length+" ky tu
");        }         chuoi = "10:20:30 127.0.0.0 Dolphin.net 10:5:3 192.14.16.23 trong.net";        Console.WriteLine("
\"" + chuoi + "\"");        Console.WriteLine("Phan chuoi thanh cac nhom: ");        quytac = new Regex(@"(?<tg>(\d|\:)+)\s"+@"(?<ip>(\d|\.)+)\s" +@"(?<web>\S+)");        foreach (Match math in quytac.Matches(chuoi))        {            Console.Write("Chuoi: " + math.Groups["tg"]+"
");            Console.Write("Chuoi: " + math.Groups["ip"] + "
");            Console.Write("Chuoi: " + math.Groups["web"] + "
");        }        Console.ReadLine();    } }