Allow for different character totals

It would be really useful is there was a way to allow for different character totals... for example, I tried to use it for Twitter profile URLs but they can be a range of lengths after the twitter.com portion. Is this doable?

Hello,

Thank you for posting your inquiry. However, it is unclear what you wish to achieve. Can you give us more information what you mean by Twitter profile ULRs? Do you mean to say a URL shortener?

Looking forward to your response.