Visa : 13 or 16 digits, starting with 4.The company can be determined from the number. We’ll exploit that difference of formats between each company to allow users to enter a number without specifying a company. Each of the credit card companies uses this number format. That makes the card number easier for humans to read. On an actual credit card, the digits of the embossed card number are usually placed into groups of four. We will learn about number format and validations of credit card numbers from multiple providers such as VISA, Mastercard, Amex and Diners etc. In this java regular expression tutorial, we will learn to use regex to validate credit card numbers.
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