function splitLines(str)
    local delim = "\r?\n"
    local result,pat,lastPos = {},"(.-)" .. delim .. "()",1
    for part, pos in string.gmatch(str, pat) do
        table.insert(result, part); lastPos = pos
    end
    table.insert(result, string.sub(str, lastPos))
    return result
end

replaced gfind (Lua 5.0) with gmatch (Lua 5.1+)