Hi

You can try something like below:

String theValue = " Proprietary information hidden, Proprietary information hidden";
    String[] test = theValue.split(",");
    for (int i = 0; i < test.length; i++) {
    try {
javax.mail.internet.InternetAddress emailAddr = new javax.mail.internet.InternetAddress(test);
emailAddr.validate();
}
catch (javax.mail.internet.AddressException ex){
return false;
}
        }
    }

The String "theValue" will be the actual value from the property, so that can be removed in your rule.

Regards

Bhavya