Would this code system be secure or be a good way to do it?

Would It Be Good To Use string.split?

Example:

local Codes = {
    "FREE/2500/Zin",
    "FR33/5/Level",
}

function TryCode(FakeCode)

    for _,Code in pairs(Codes) do

        local RealCode = string.split(Code,"/")

        --[[
            RealCode[1] would be the code in the codes table
            RealCode[2] would be the amount of the reward
            RealCode[3] would be what the reward is
        ]]--

        if RealCode[1] == FakeCode then

            print("Award "..RealCode[2].." "..RealCode[3].."(s)")

        end

    end

end