Cross post on the bit.ly group here,
http://groups.google.com/group/bitly-api/browse_thread/thread/ffbf603c9746998f
. Jehiah says it's [-_a-zA-Z0-9]+ , aka. 'base64url' encoding,
http://en.wikipedia.org/wiki/Base64#URL_applications .

On Apr 19, 10:52 am, Alexander Sicular <sicul...@gmail.com> wrote:
> Hi All,
>
> My question is what the allowable char set is for bitly and soon to be 
> twitter short URLs. Are they simply [0-9][A-Z][a-z] which would make it 
> base62 and not a true base64? Are there characters I'm not including? Will 
> Twitter's set match bitly's character set? Please share links if you got em!
>
> Thank you, Alexander
>
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