Cross post on the group here,
. Jehiah says it's [-_a-zA-Z0-9]+ , aka. 'base64url' encoding, .

On Apr 19, 10:52 am, Alexander Sicular <> 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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