Update regex to allow periods in check names
Update regex to allow periods in check names

* regex will allow periods anywhere but the beginning of the check name
* verified with http://rubular.com/r/bgptLyK6F4

javrasya/sensu,cread/sensu,m4ce/sensu,pauloconnor/sensu,yonglehou/sensu,keymone/sensu,bf4/sensu,upfluence/sensu,portertech/sensu,roobert/sensu,npe9/sensu,sensu/sensu,quodlibetor/sensu,rbramwell/sensu,solarkennedy/sensu,somic/sensu,miyakawataku/sensu,crewton/sensu,withnale/sensu