local words = {"swear", "swear", "badword", "another_swear"}
local gold = minetest.get_color_escape_sequence("#ffdf00")
local white = minetest.get_color_escape_sequence("#ffffff")

minetest.register_on_chat_message(function(name, message)

	if not message then
		return
	end

	if not minetest.get_player_privs(name).shout then
		return true
	end

	local msg = message:lower()

	for n = 1, #words do

		if msg:find( words[n] ) then

			minetest.kick_player(name, "( ** WATCH YOUR LANGUAGE ** )")
			minetest.chat_send_all("** " .. name .. " kicked for  swearing.")
			return true -- do not show message
		end
	end
	message = message:gsub("%s+", " ")
	minetest.chat_send_all("<" .. gold .. name .. white .. "> " .. message)
	return true
end)