I had to work with strings in Lua today, and found that there was some significant differences between 5.0 and 5.1.
The Lua Wiki was quite helpful, except I found one code snibbet which didn't work for me, it was missing "then" at the end of line two in after the if statement:
function url_encode(str) if (str) then str = string.gsub (str, "\n", "\r\n") str = string.gsub (str, "([^%w ])", function (c) return string.format ("%%%02X", string.byte(c)) end) str = string.gsub (str, " ", "+") end return str end local hi = url_encode("blah") print(hi)