$ga_query = "?utm_source=" . $source . "&utm_medium=email&utm_campaign=" . $subject;
$body = "Test test test test https://domain.com/faq
     test test http://domain.com/faq  test
     http://domain.com/order#test";
$content = $this->addGa($body, 'test_subject', 'newsletter');
private function addGa($body, $subject, $source = "newsletter")
    {
        $ga_query = "?utm_source=" . $source . "&utm_medium=email&utm_campaign=" . $subject;
        $content = preg_replace('/.domain\.com\/[^"]+/', '$0' . $ga_query, $body);
        return $content;
    }