Equivalent pattern to “[\0-\x7F\xC2-\xF4][\x80-\xBF]*” in Lua 5.1

Question

When answering this question, I wrote this code to iterate over the UTF-8 byte sequence in a string:

local str = \"KORYTNAČKA\"
for c in str:gmatch(\"[\\0-\\         


        

Answer 1

See the Lua 5.1 manual on patterns.

A pattern cannot contain embedded zeros. Use %z instead.

In Lua 5.2, this was changed so that you could use \0 instead, but not so for 5.1. Simply add %z to the first set and change the first range to \1-\127.