[validation] What is the best Java email address validation method?

Heres my pragmatic approach, where I just want reasonable distinct blah@domain addresses using the allowable characters from the RFC. Addresses must be converted to lowercase beforehand.

public class EmailAddressValidator {

    private static final String domainChars = "a-z0-9\\-";
    private static final String atomChars = "a-z0-9\\Q!#$%&'*+-/=?^_`{|}~\\E";
    private static final String emailRegex = "^" + dot(atomChars) + "@" + dot(domainChars) + "$";
    private static final Pattern emailPattern = Pattern.compile(emailRegex);

    private static String dot(String chars) {
        return "[" + chars + "]+(?:\\.[" + chars + "]+)*";
    }

    public static boolean isValidEmailAddress(String address) {
        return address != null && emailPattern.matcher(address).matches();
    }

}

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