diff --git a/mods/creative/inventory.lua b/mods/creative/inventory.lua
index 08f92649..a8165342 100644
--- a/mods/creative/inventory.lua
+++ b/mods/creative/inventory.lua
@@ -196,7 +196,7 @@ function creative.register_tab(name, title, items)
 					and fields.creative_filter then
 				inv.start_i = 0
 				inv.filter = fields.creative_filter:sub(1, 128) -- truncate to a sane length
-						:gsub("[%z-\8\11-\31\127]", "") -- strip naughty control characters (keeps \t and \n)
+						:gsub("[%z\1-\8\11-\31\127]", "") -- strip naughty control characters (keeps \t and \n)
 						:lower() -- search is case insensitive
 				sfinv.set_player_inventory_formspec(player, context)
 			elseif not fields.quit then
diff --git a/mods/default/craftitems.lua b/mods/default/craftitems.lua
index 07258378..3cd5da7d 100644
--- a/mods/default/craftitems.lua
+++ b/mods/default/craftitems.lua
@@ -179,7 +179,7 @@ minetest.register_on_player_receive_fields(function(player, formname, fields)
 		data.description = S("\"@1\" by @2", short_title, data.owner)
 		data.text = fields.text:sub(1, max_text_size)
 		data.text = data.text:gsub("\r\n", "\n"):gsub("\r", "\n")
-		data.text = data.text:gsub("[%z-\8\11-\31\127]", "") -- strip naughty control characters (keeps \t and \n)
+		data.text = data.text:gsub("[%z\1-\8\11-\31\127]", "") -- strip naughty control characters (keeps \t and \n)
 		data.page = 1
 		data.page_max = math.ceil((#data.text:gsub("[^\n]", "") + 1) / lpp)
 
diff --git a/mods/mtg_craftguide/init.lua b/mods/mtg_craftguide/init.lua
index 74802e9d..55b76d75 100644
--- a/mods/mtg_craftguide/init.lua
+++ b/mods/mtg_craftguide/init.lua
@@ -348,7 +348,7 @@ local function on_receive_fields(player, fields)
 	elseif (fields.key_enter_field == "filter" or fields.search)
 			and fields.filter then
 		local new = fields.filter:sub(1, 128) -- truncate to a sane length
-				:gsub("[%z-\8\11-\31\127]", "") -- strip naughty control characters (keeps \t and \n)
+				:gsub("[%z\1-\8\11-\31\127]", "") -- strip naughty control characters (keeps \t and \n)
 				:lower() -- search is case insensitive
 		if data.filter == new then
 			return