You can search for RS3 object (scenery) names here - search is case insensitive (eg portaln). You can also use regular expressions by surrounding the search in // (e.g. /portal/). You can also search by ID here - you can search single IDs (4151), ranges (4751-4851), and offsets (4751+100), as well as recents (recent50). See also riblet's regex guide.