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On 7 April 2016 at 16:40, Marc Balmer <> wrote:
(Expected is 'ÄÖÜ')

You need an external library which understands all of Unicode. Not advocating anything in particular, just picking a first 'Lua utf8' library that a simple web search returned:

$ sudo luarocks install luautf8
$ lua
Lua 5.1.5  Copyright (C) 1994-2012, PUC-Rio
> utf8 = require 'lua-utf8'
> = utf8.upper('äöü')
> for m in utf8.gmatch('äöü', '%g+') do print(m) end