diff --git a/init.lua b/init.lua
index ffa894d..d0076ed 100644
--- a/init.lua
+++ b/init.lua
@@ -1,3 +1,4 @@
 dofile(minetest.get_modpath("illuna").."/nodes.lua")
 dofile(minetest.get_modpath("illuna").."/crafting.lua")
 dofile(minetest.get_modpath("illuna").."/commands.lua")
+dofile(minetest.get_modpath("illuna").."/register.lua")
diff --git a/register.lua b/register.lua
new file mode 100644
index 0000000..f2f9583
--- /dev/null
+++ b/register.lua
@@ -0,0 +1,27 @@
+local disallowed = {
+	["guest"]				=	"Guest accounts are disallowed on this server.  "..
+								"Please choose a proper username and try again.",
+	["^[0-9]+$"]			=	"All-numeric usernames are disallowed on this server. "..
+								"Please choose a proper username and try again.",
+	["[0-9].-[0-9].-[0-9].-[0-9].-[0-9]"]	=	"Too many numbers in your username. "..
+												"Please try again with less than five digits in your username."
+}
+minetest.register_on_prejoinplayer(function(name, ip)
+	local lname = name:lower()
+	for re, reason in pairs(disallowed) do
+		if lname:find(re) then
+			return reason
+		end
+	end
+
+	if #name < 2 then
+		return "Too short of a username. "..
+				"Please pick a name with at least two letters and try again."
+	end
+
+	if  #name > 30 then
+				return "Too long username. "..
+				"Please pick a name with no more 30 letters and try again."
+	end
+
+end)
\ No newline at end of file