URSH: Fix regex, catch more invalid URLs
URSH: Fix regex, catch more invalid URLs

ThiefMaster/indico-plugins,indico/indico-plugins,ThiefMaster/indico-plugins,indico/indico-plugins,ThiefMaster/indico-plugins,ThiefMaster/indico-plugins,indico/indico-plugins,indico/indico-plugins