Resolve "Remote DNS: Getting zone id of subdomain prohibited by regex"

teuto.netrequested to merge
(removed):4522-fix-regex into master

Closes #4522 (closed)

  • TLD length must be between 2 and 63 (RFC allows 63 chars per TLD)
  • zones are allowed to be 3 chars with hyphen, or 2 characters (alpha-numeric)

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