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Hey, thanks for that link, this kind of stuff is why I came to ask here. I read that your module does changes to the global environment (in the default load manner), are any of those changes backwards incompatible with code written for plain 5.1?

On Thu, 13 Apr 2017 6:47 pm Philipp Janda, <> wrote:
Am 13.04.2017 um 16:28 schröbte Luiz Henrique de Figueiredo:
>> I'd like to add support for dealing with utf-8 text in Lua 5.1 - for
>> functions such as string.gsub, string.len and etc. I'm aware 5.3 comes with
>> a utf8 library but I'm not considering breaking capability for the huge
>> ecosystem of code that's been developed for 5.1 for my application just yet.
>> I know there's starwing/luautf8, are there any other options that I should
>> be considering?
> With the simple changes below, lutf8lib.c from 5.3 compiles fine in 5.1.
> I haven't tested it though.

It won't work because of `lua_pushfstring(L, "%U", ?)`. You can #define
it to something reasonable, though. Compat-5.3[1] has lutf8lib.c
backported to Lua 5.1, btw.

>     10d9
>     < #include "lprefix.h"
>     250,251c249,250
>     < LUAMOD_API int luaopen_utf8 (lua_State *L) {
>     <   luaL_newlib(L, funcs);
>     ---
>     > LUALIB_API int luaopen_utf8 (lua_State *L) {
>     >   luaL_register(L, "utf8", funcs);