There is no way to do this natively, I'm afraid.
Thank you for your reply.
Is it possible to solve this problem with Bamboo integration (release naming using variables) or try some plugins?
You could use Bamboo with a good naming scheme so that users aren't tempted, but it won't stop them adding their own with letters in them.
Another thought sprang to mind for me - if you're willing to code (or use ScriptRunner), you could write a listener that picks up "version created" events, and does something with them. My initial idea would be "remove all non-numeric characters and check it's not now a duplicate, removing the version if it is, and renaming it if it's new", but you'd have to explain that carefully to your users.
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