Piwik\Version::isStableVersion PHP Method

    public function isStableVersion($version)
    {
        return (bool) preg_match('/^(\\d+)\\.(\\d+)\\.(\\d+)$/', $version);
    }

 protected function sendNotifications()
 {
     $latestVersion = $this->getLatestVersion();
     $host = SettingsPiwik::getPiwikUrl();
     $subject = Piwik::translate('CoreUpdater_NotificationSubjectAvailableCoreUpdate', $latestVersion);
     $message = Piwik::translate('ScheduledReports_EmailHello');
     $message .= "\n\n";
     $message .= Piwik::translate('CoreUpdater_ThereIsNewVersionAvailableForUpdate');
     $message .= "\n\n";
     $message .= Piwik::translate('CoreUpdater_YouCanUpgradeAutomaticallyOrDownloadPackage', $latestVersion);
     $message .= "\n";
     $message .= $host . 'index.php?module=CoreUpdater&action=newVersionAvailable';
     $message .= "\n\n";
     $version = new Version();
     if ($version->isStableVersion($latestVersion)) {
         $message .= Piwik::translate('CoreUpdater_ViewVersionChangelog');
         $message .= "\n";
         $message .= $this->getLinkToChangeLog($latestVersion);
         $message .= "\n\n";
     }
     $message .= Piwik::translate('CoreUpdater_FeedbackRequest');
     $message .= "\n";
     $message .= 'http://piwik.org/contact/';
     $this->sendEmailNotification($subject, $message);
 }