diff --git a/reg-tests/lua/b00002_print_r.lua b/reg-tests/lua/b00002_print_r.lua
new file mode 100644
index 0000000..185614f
--- /dev/null
+++ b/reg-tests/lua/b00002_print_r.lua
@@ -0,0 +1,96 @@
+-- Copyright 2016 Thierry Fournier
+
+function color(index, str)
+	return "\x1b[" .. index .. "m" .. str .. "\x1b[00m"
+end
+
+function nocolor(index, str)
+	return str
+end
+
+function sp(count)
+	local spaces = ""
+	while count > 0 do
+		spaces = spaces .. "    "
+		count = count - 1
+	end
+	return spaces
+end
+
+function escape(str)
+	local s = ""
+	for i = 1, #str do
+		local c = str:sub(i,i)
+		local ascii = string.byte(c, 1)
+		if ascii > 126 or ascii < 20 then
+			s = s .. string.format("\\x%02x", ascii)
+		else
+			s = s .. c
+		end
+	end
+	return s
+end
+
+function print_rr(p, indent, c, wr, hist)
+	local i = 0
+	local nl = ""
+
+	if type(p) == "table" then
+		wr(c("33", "(table)") .. " " .. c("36", tostring(p)) .. " [")
+
+		for idx, value in ipairs(hist) do
+			if value == p then
+				wr(" " .. c("35", "/* recursion */") .. " ]")
+				return
+			end
+		end
+		hist[indent + 1] = p
+
+		mt = getmetatable(p)
+		if mt ~= nil then
+			wr("\n" .. sp(indent+1) .. c("31", "METATABLE") .. ": ")
+			print_rr(mt, indent+1, c, wr, hist)
+		end
+
+		for k,v in pairs(p) do
+			if i > 0 then
+				nl = "\n"
+			else
+				wr("\n")
+			end
+			wr(nl .. sp(indent+1))
+			if type(k) == "number" then
+				wr(c("32", tostring(k)))
+			else
+				wr("\"" .. c("32", escape(tostring(k))) .. "\"")
+			end
+			wr(": ")
+			print_rr(v, indent+1, c, wr, hist)
+			i = i + 1
+		end
+		if i == 0 then
+			wr(" " .. c("35", "/* empty */") .. " ]")
+		else
+			wr("\n" .. sp(indent) .. "]")
+		end
+
+		hist[indent + 1] = nil
+
+	elseif type(p) == "string" then
+		wr(c("33", "(string)") .. " \"" .. c("36", escape(p)) .. "\"")
+	else
+		wr(c("33", "(" .. type(p) .. ")") .. " " .. c("36", tostring(p)))
+	end
+end
+
+function print_r(p, col, wr)
+	if col == nil then col = true end
+	if wr == nil then wr = function(msg) io.stdout:write(msg) end end
+	local hist = {}
+	if col == true then
+		print_rr(p, 0, color, wr, hist)
+	else
+		print_rr(p, 0, nocolor, wr, hist)
+	end
+	wr("\n")
+end