simplify regexps
simplify regexps

gravitystorm/carto,pnorman/carto,mapbox/carto,stefanklug/carto,madeinqc/carto,CartoDB/carto,1ec5/carto,CartoDB/carto,clhenrick/carto,midnightcomm/carto,tomhughes/carto,whitelynx/carto