C#驗證郵件的正則表達式的代碼

　　驗證輸入的正確性

　　public static bool isEmail( string inputEmail )

　　{

　　inputEmail = NulltoString( inputEmail );

　　string strRegex = @^( [azAZ_]+ )@( ( [[]{}[]{}[]{} )|( ( [azAZ]+ )+ ) )( [azAZ]{}|[]{} )( ]? )$;

　　Regex re = new Regex( strRegex );

　　if ( reIsMatch( inputEmail ) )

　　return ( true );

　　else

　　return ( false );

　　}

　　驗證郵件地址的正確性

　　string[] host = ( addressSplit( @ ) );

　　string hostname = host[];

　　IPHostEntry IPhst = DnsResolve( hostname );

　　IPEndPoint endPt = new IPEndPoint( IPhstAddressList[] );

　　Socket s= new Socket( endPtAddressFamily SocketTypeStreamProtocolTypeTcp );

　　sConnect( endPt );

　　//Attempting to connect

　　if( !Check_Response( s SMTPResponseCONNECT_SUCCESS ) )

　　{

　　sClose( );

　　return false;

　　}

　　//HELO server

　　Senddata( s stringFormat( HELO {}rn DnsGetHostName( )) );

　　if( !Check_Response( s SMTPResponseGENERIC_SUCCESS ) )

　　{

　　sClose( );

　　return false;

　　}

　　//Identify yourself

　　//Servers may resolve your domain and check whether you are listed in BlackLists etc

　　Senddata( s stringFormat( MAIL From: {}rntestexampleuk ) );

　　if( !Check_Response( s SMTPResponseGENERIC_SUCCESS ) )

　　{

　　sClose( );

　　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 SMTPResponseGENERIC_SUCCESS ) )

　　{

　　sClose( );

　　return false;

　　}

　　return ( true );

From:http://tw.wingwit.com/Article/program/net/201311/12817.html