Canadian postal code, letter digit letter then digit letter digit. The letter classes drop D, F, I, O, Q and U, which Canada Post never uses because they read as digits, so the shape alone is already selective.
Label: CA_POSTAL
(?<!\w)[A-CEGHJ-NPR-TVXY]\d[A-CEGHJ-NPR-TV-Z]\s?\d[A-CEGHJ-NPR-TV-Z]\d(?!\w)Ottawa, K1A 0B1 for the mail room. → K1A 0B1Postal code H3Z2Y7 in Montreal. → H3Z2Y7Postal code D1A 0B1Postal code K1A 0BTags: ca, location, contact