How to find the continuation of string in chat?

So in one of my games, we ran into an issue. We are having a /play gamepass / radio.
I need help on something, how do i find the continuation of the string after the 6th character?

game.Players.PlayerAdded:Connect(function(plr)
    plr.Chatted:connect(function(msg)
        if msg:lower():sub(1, 6) == '/play ' then
            --how do i find the rest of the characters after the  6th?
        end
    end)
end)

How do I find it? If you know how, please tell us! Thanks.

print(msg:sub(7))
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