public class EmailValidator { private static Pattern pattern; private static Matcher matcher; private static final String EMAIL_PATTERN = "^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@" + "[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$"; static{ pattern = Pattern.compile(EMAIL_PATTERN); } public EmailValidator() { } /** * Validate hex with regular expression * * @param hex * hex for validation * @return true valid hex, false invalid hex */ public static boolean validate(final String hex) { matcher = pattern.matcher(hex); return matcher.matches(); } }