Italian VAT number: eleven digits, optionally prefixed IT for intra-community use. Eleven bare digits also match the Polish PESEL and the Australian business number, so those three cannot share a detector.
Label: IT_PARTITA_IVA
(?<!\w)(?:IT)?\d{11}(?!\w)Partita IVA 12345678903 in fattura. → 12345678903Codice IT12345678903 per l'estero. → IT12345678903Partita IVA 1234567890Partita IVA 123456789034Tags: it, business, accounting