From b69fc35c888c569bf7e87e24466740ca5f749918 Mon Sep 17 00:00:00 2001
From: ShadowNinja <shadowninja@minetest.net>
Date: Sat, 21 Dec 2013 12:26:37 -0500
Subject: [PATCH] Allow Lua regexs in search, and check for bad ones

---
 internal.lua | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/internal.lua b/internal.lua
index 6d7c464..daf8f4b 100644
--- a/internal.lua
+++ b/internal.lua
@@ -92,14 +92,9 @@ function unified_inventory.apply_filter(player, filter)
 	local player_name = player:get_player_name() 
 	local size = 0
 	local lfilter = string.lower(filter)
-	if lfilter ~= "" then 
-		for c in lfilter:gmatch(".") do
-			if c == '[' or c == ']' or c == '{' or c == '}' or
-			   c == '(' or c == ')' or c == '%' then 
-				lfilter = ""
-				break
-			end
-		end
+	if not pcall(function() ("technic:test"):find(lfilter) end) then
+		-- Filter is invalid
+		lfilter = ""
 	end
 	unified_inventory.filtered_items_list[player_name]={}
 	for name, def in pairs(minetest.registered_items) do