I am using C# to read data from a Serial Port, and was wondering if there was a way to abort reading data from a serial port if it is not in the exact format for example !COM data in is the right format and not #POM data in.

After initializing the serial port I ran this one line:

mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

private void MySerialPort_DataReceived(object sender, SerialDataReceivedEventArgs e) {
        throw new NotImplementedException(); }
    
        private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
        {
            Regex reg = new Regex(@"A!COM");
            var sp = (SerialPort)sender;
            string indata = sp.ReadExisting();
            if (reg.IsMatch(indata) is true)
            {
                Console.WriteLine($"Data Received from a COM Port {sp.PortName}:");
            }
            else{
             break;
            }
            
            Console.WriteLine(indata);
        }