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

It should be something like this:

^[a-zA-Z0-9]+(-[a-zA-Z0-9]+)*$

You are telling it to look for only one char, either a-z, A-Z, 0-9 or -, that is what [] does.

So if you do [abc] you will match only "a", or "b" or "c". not "abc"

Have fun.