เอาโค้ด ตัวอย่างการใช้งาน Regex มาฝาก ครับ เผื่อเป็นประโยชน์

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Windows.Forms;

namespace csharphelper_Load
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
           // Application.Run(new Form1());
            string html, Fol = @"C:\csharphelper_Code";

            if (!System.IO.Directory.Exists(Fol)) System.IO.Directory.CreateDirectory(Fol);
            for (int i = 1; i < 500; i++)
            {
                html =  getHTML("http://csharphelper.com/blog/page/" + i + "/");
                foreach (Match myMatch in new Regex(@"<a href=""(http://www.csharphelper.com/.*?.zip)"">", RegexOptions.None).Matches(html))
                {
                    using (System.Net.WebClient webClient = new  System.Net.WebClient())
                    {
                        try
                        {
                            
                            webClient.DownloadFileAsync(new Uri( myMatch.Groups[1].Value), RenameFileDup(Fol + "\\" + System.IO.Path.GetFileName(myMatch.Groups[1].Value)));
                            System.Threading.Thread.Sleep(1000);
                        }
                        catch { }

                    }
                }

                System.Threading.Thread.Sleep(1000);
            }
            MessageBox.Show("Load Complete.... By TOR@CHEMISTRY");
        }
        public static string RenameFileDup(string _File)
        {
            string stg = _File;
            if (System.IO.File.Exists(_File))
            {
                int i = 1;
                do
                {
                    stg = System.IO.Path.GetDirectoryName(_File) + "\\" + System.IO.Path.GetFileNameWithoutExtension(_File) + "_" + i + System.IO.Path.GetExtension(_File);
                    i++;
                } while (System.IO.File.Exists(stg));
            }
            return stg;
        }
        public static string getHTML(string url)
        {


            string html = "";
            try
            {
                System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url.Trim());
                System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
                System.IO.StreamReader sr = new System.IO.StreamReader(response.GetResponseStream());
                html = sr.ReadToEnd();
                sr.Close();
                response.Close();
            }
            catch { }
            return html;
        }

    }
}