C#验证邮件格式URL格式整数正则方法

using System;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text.RegularExpressions;

public partial class _Default : System.Web.UI.Page 
{
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (IsValidEmail(TextBox1.Text))
        {
            Response.Write("郵件格式正確");
        }
        else {Response.Write("郵件格式不正確"); }
    }

    static public bool IsValidEmail(string email)
         {
              return Regex.IsMatch(email,@"^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$");
         }
          static public bool IsValidURL(string url)
         {
             return Regex.IsMatch(url,@"^(http|https|ftp)\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(:[a-zA-Z0-9]*)?/?([a-zA-Z0-9\-\._\?\,\'/\\\+&%\$#\=~])*[^\.\,\)\(\s]$");
         }
         static public bool IsValidInt(string val)
         {
             return Regex.IsMatch(val,@"^[1-9]\d*\.?[0]*$");
         }
         protected void Button2_Click(object sender, EventArgs e)
         {

         }
       
    
         protected void Button3_Click(object sender, EventArgs e)
         {
              if (IsValidInt(TextBox3.Text))
         {
            Response.Write("整數格式正確");

         }
            else 
              {Response.Write("整數格式不正確"); }
      }
         
}