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C#验证邮件的正则表达式的代码

2008-03-06 15:38 260 查看
导读:
  验证输入的正确性
  public static bool isEmail(string inputEmail)
  {
  inputEmail = NulltoString(inputEmail);
  string strRegex = @"^([a-zA-Z0-9_/-/.]+)@((/[[0-9]{1,3}/.[0-9]{1,3}/.[0-9]{1,3}/.)|(([a-zA-Z0-9/-]+/.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(/]?)$";
  Regex re = new Regex(strRegex);
  if (re.IsMatch(inputEmail))
  return (true);
  else
  return (false);
  }
  验证邮件地址的正确性:
  string[] host = (address.Split(@));
  string hostname = host[1];
  IPHostEntry IPhst = Dns.Resolve(hostname);
  IPEndPoint endPt = new IPEndPoint(IPhst.AddressList[0], 25);
  Socket s= new Socket(endPt.AddressFamily, SocketType.Stream,ProtocolType.Tcp);
  s.Connect(endPt);
  //Attempting to connect
  if(!Check_Response(s, SMTPResponse.CONNECT_SUCCESS))
  {
  s.Close();
  return false;
  }
  //HELO server
  Senddata(s, string.Format("HELO {0}/r/n", Dns.GetHostName() ));
  if(!Check_Response(s, SMTPResponse.GENERIC_SUCCESS))
  {
  s.Close();
  return false;
  }
  //Identify yourself
  //Servers may resolve your domain and check whether you are listed in BlackLists etc.
  Senddata(s, string.Format("MAIL From: {0}/r/n","testexample@deepak.portland.co.uk"));
  if(!Check_Response(s, SMTPResponse.GENERIC_SUCCESS))
  {
  s.Close();
  return false;
  }
  //Attempt Delivery (I can use VRFY, but most SMTP servers only disable it for security reasons)
  Senddata(s, address);
  if(!Check_Response(s, SMTPResponse.GENERIC_SUCCESS))
  {
  s.Close();
  return false;
  }
  return (true);

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