Most effecient way of generating a table of allowed maps from a filter?

[tgp1994]

I bet that was confusing. Here's a better explanation:

I'm making a map vote system. First, I want to generate a table of allowed maps, from a set table of prefixes. Here's what I have so far:

local allowedmaps = {"^zs_", "^cs_", "^de_", "^zm_", "^zh_"}
availmaps = {}

function init()
	print("Filling availmaps table...")
	local maps = file.Find( "../maps/*.bsp" )
	print("Found a total of "..#maps.." maps in the maps folder.")
	for _, map in ipairs( maps ) do
		map = map:sub( 1, -5 ) -- Take off .bsp
		--if allowedmaps[ map ] then
		if string.find(map, allowedmaps) then
			table.insert( availmaps, map )
			print("Found available map named "..map..".")
		end
	end
	print("Found "..#availmaps.." available maps!")
	table.sort(availmaps)
end

hook.Add("InitPostEntity", "MapStartTrigger", init)

So far, it doesn't work. Is there any quick way to have string.find automatically check the allowed maps table against the map string, or do I have to do another for function?