Android之郵箱註冊Regex

protected void Check() { if (USERNAME.equals("") || PASSWORD.equals("")) { Toast.makeText(context, "帳號或密碼不可為空", Toast.LENGTH_SHORT) .show(); } else if (!EmailFormat(USERNAME) || USERNAME.length() > 31) { Toast.makeText(context, "帳號不為郵箱或格式不正確", Toast.LENGTH_LONG) .show(); } else if (PASSWORD.length() < 6 || PASSWORD.length() > 15) {  Toast.makeText(context, "密碼長度應在6～15位！", Toast.LENGTH_LONG) .show(); } else { login(); } } private boolean EmailFormat(String eMAIL1) {//郵箱判斷Regex Pattern pattern = Pattern .compile("\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*"); Matcher mc = pattern.matcher(USERNAME); return mc.matches(); }