From EasyPrivacy[1]
/piwik-$domain=~piwik.org /piwik.$script,domain=~piwik.org /piwik.php /piwik/js/*$domain=~piwik.org /piwik1. /piwik2.js /piwik_ /piwikapi.js /piwikC_ /piwikTracker.
[1] https://easylist-downloads.adblockplus.org/easyprivacy.txt
From EasyPrivacy[1]
This doesn't include any renamed versions, nor does it include the numerous domain-specific variations.[1] https://easylist-downloads.adblockplus.org/easyprivacy.txt