[Android] email 정규식 pattern check

   //이메일 유효성 검사
    private boolean isValidEmail(String userEmail) {
        if (userEmail.isEmpty()) {
            Toast.makeText(FindPwActivity.this, R.string.str_edit_wrong_text, Toast.LENGTH_SHORT).show();
            return false;
        } else if (!Patterns.EMAIL_ADDRESS.matcher(userEmail).matches()) {
            binding.visibleErrorEmailTx.setVisibility(View.VISIBLE);
//            Toast.makeText(FindPwActivity.this, R.string.str_edit_wrong_email, Toast.LENGTH_SHORT).show();
            return false;
        } else {
            return true;
        }