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$rx_4333 = qr/
(?:
    4     3     3     [3-9]
...
  | [5-9] \d    \d    \d
)
$/x

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$rx_4333 = /
(?: 4 (?: 3 (?: 3 [3-9]
              | [4-9] \d )
        | [4-9] \d \d )
  | [5-9] \d \d \d )
$/x