Regex for [a-zA-Z0-9\-] with dashes allowed in between but not at the start or end

Question

Update:

This question was an epic failure, but here\'s the working solution. It\'s based on Gumbo\'s answer (Gumbo\'s was close to working so I chose it as the accepte

Answer 1

If you simply don't want a dash at the end and beginning, try ^[^-].*?[^-]$

Edit: Bah, you keep changing it.