A better RE?

[Jim]

Eddie Corns wrote:
> Just a small point - what does "in order" mean here? if it means that eg 1362
> is not valid then you're stuck because it's context sensitive and hence not
> regular.
I'm not seeing that.  Any finite language is regular -- as a last
resort you could list all ascending sequences of 7 or fewer digits (but
perhaps I misunderstood the original poster's requirements).

Jim