Validate major credit card formats including Visa, MasterCard, American Express, Diners Club, and Discover.
^(?:4[0-9]12(?:[0-9]3)?|5[1-5][0-9]14|3[47][0-9]13|3[0-9]13|6(?:011|5[0-9]2)[0-9]12)$4[0-9]{12}(?:[0-9]{3})?5[1-5][0-9]{14}3[47][0-9]{13}3[0-9]{13}6(?:011|5[0-9]{2})[0-9]{12}// Credit card validation regex
const creditCardRegex = /^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|3[0-9]{13}|6(?:011|5[0-9]{2})[0-9]{12})$/;
function validateCreditCard(cardNumber) {
// Remove spaces and dashes
const cleanNumber = cardNumber.replace(/[s-]/g, '');
return creditCardRegex.test(cleanNumber);
}
// Usage examples
console.log(validateCreditCard("4532123456789012")); // true (Visa)
console.log(validateCreditCard("5555 5555 5555 4444")); // true (MasterCard)
console.log(validateCreditCard("1234567890123456")); // false"4532123456789012"Visa card (16 digits)
"4532-1234-5678-9012"Visa card with dashes
"5555555555554444"MasterCard (16 digits)
"5555 5555 5555 4444"MasterCard with spaces
"378282246310005"American Express (15 digits)
"371449635398431"American Express (15 digits)
"6011111111111117"Discover card
"1234567890123456"Invalid card number
"4532123456789"Too short for Visa
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