Matches Visa in 1-4-4-4, 1 4 4 4 and 13 format Mask Visa-13 CC QUARANTINE \b4\s?-?\s?(?:\d{4}\s?-?\s?){3}\b 1 Matches Discover in 4-4-4-4, 4 4 4 4 and 16 format Mask Discover CC QUARANTINE \b6011\s?-?\s?(?:\d{4}\s?-?\s?){3}\b 1 Matches Visa in 4-4-4-4, 4 4 4 4 and 16 format Mask Visa CC QUARANTINE \b4\d{3}\s?-?\s?(?:\d{4}\s?-?\s?){3}\b 1 Matches Dinersclub in 4-6-4, 4 6 4 and 14 format Mask Dinersclub CC QUARANTINE \b3(?:0[0-5]|6\d|8\d)\d\s?-?\s?\d{6}\s?-?\s?\d{4}\b 1 Matches JCB-15 in 3-4-4-4, 3 4 4 4 and 15 format Mask JCB-15 CC QUARANTINE \b(?:213\s?-?\s?1|180\s?-?\s?0)\d{3}\s?-?\s?(?:\d{4}\s?-?\s?){2}\b 1 Matches American Express in 4-6-5, 4 6 5 and 15 format Mask Amex CC QUARANTINE \b3[47]\d{2}\s?-?\s?\d{6}\s?-?\s?\d{5}\b 1 Matches Mastercard in 4-4-4-4, 4 4 4 4 and 16 format Mask Mastercard CC QUARANTINE \b5[1-5]\d{2}\s?-?\s?(?:\d{4}\s?-?\s?){3}\b 1 Matches JCB in 4-4-4-4, 4 4 4 4 and 16 format Mask JCB CC QUARANTINE \b35\d{2}\s?-?\s?(?:\d{4}\s?-?\s?){3}\b 1 Visa CC Visa-13 CC Mastercard CC Dinersclub CC JCB CC Discover CC JCB-15 CC Amex CC Credit cards