Uživatel:Jirka.Pavlik.test/common.js

var persistentId = mw.config.get('persistent-id');

if (persistentId.match(/^https:\/\/cas.cuni.cz\/idp\/shibboleth!https:\/\/wikisofia.cz\/shibboleth!.{28}$/)) {
    persistentId = persistentId.substring(67,95);
    alert(persistentId);
}