On Mon, Jul 10, 2017 at 4:03 PM, Lennart Poettering
<lennart at poettering.net> wrote:
> On current Fedora, the current regex useradd enforces appears to be
> this:
>
> [a-zA-Z0-9._][a-zA-Z0-9._-]{0,30}[a-zA-Z0-9._-$]?
So, it *does* allow for usernames starting with numbers...