Indian permanent account number, five letters then four digits then a letter, with the fourth position restricted to the entity type letters, P for an individual, C for a company, H for a Hindu undivided family, F for a firm and so on. That restriction is what lifts the pattern above a generic five-letter, four-digit token. Narrowing the fourth position to P alone would keep individuals only and drop company PANs. No collision.
Label: IN_PAN
\b[A-Z]{3}[ABCFGHJLPT][A-Z]\d{4}[A-Z]\bPAN: AAAPZ1234C → AAAPZ1234CLe formulaire cite ABCPK1234M comme PAN. → ABCPK1234MABCDE1234ABCXE1234FTags: in, government-id, identity