function test_balanced_scan( s )
	print( '----> ', s )
	for w in string.gfind(s, "%b{}") do
		print(w)
	end
end
test_balanced_scan( "Hallo {schöne und wunderbare} Welt" )
test_balanced_scan( "Hallo {schöne {und} wunderbare} Welt" )