Wikimedia Bugzilla is closed!

It would be quite useful if we had a blacklist (regex-supporting) for preventing inclusion of sitelinks matching a line in the blacklist, for example, an entry like:
    (en|simple)wiki:User( talk)?:*/[Ss]andbox
would block addition of sitelinks on the English or Simple English Wikipedias in userspace that are a sandbox subpage. A special right would be needed for bypassing these sitelinks, though bots should probably not have this right (at least not on Wikidata, if implemented, could be allowed by default), considering that bots often create such items that should be deleted per policies. It would be far too difficult for each bot operator to create a list of such pages, plus new users might not be aware of those policies etc.