Indian Aadhaar number, twelve digits in three groups of four. The separator is required rather than optional: twelve bare digits are also a phone number, a card number fragment and a dozen other things, and the grouped form is how Aadhaar is actually written. The first digit is never a 0 or a 1.
Label: IN_AADHAAR
(?<!\w)[2-9]\d{3}[\s-]\d{4}[\s-]\d{4}(?!\w)(?![\s.-]?\d)My Aadhaar is 2234 5678 9012 on the card. → 2234 5678 9012Enter 9876-5432-1098 in the KYC form. → 9876-5432-1098The number 1234 5678 9012 cannot start with oneReference 223456789012Tags: in, government-id, identity