public static boolean isEmail(String email) { String reg = "^([a-zA-Z0-9_\\-\\.]+)@((\\[[0-9]{1,3}\\.[0-9]{1,3}\\.)|(([a-zA-Z0-9\\-]+\\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\\]?)$"; Pattern pattern = Pattern.compile(reg); Matcher matcher = pattern.matcher(email); return matcher.matches(); }