My bad, it actually works better
^[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*(?:[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*)*$
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My bad, it actually works better
^[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*(?:[a-z](-[a-z0-9](-[a-z0-9])*)?([a-z0-9]-[a-z0-9]|[a-z0-9])*)*$