const cards = {
    visa      : /^4[0-9]{12}(?:[0-9]{3})/,
    mastercard : /^5[1-5][0-9]{14}/,
    diners    : /^3(?:0[0-5]|[68][0-9])[0-9]{11}/,
    amex      : /^3[47][0-9]{13}/,
    discover  : /^6(?:011|5[0-9]{2})[0-9]{12}/,
    hipercard  : /^(606282\d{10}(\d{3})?)|(3841\d{15})/,
    elo        : /^((((636368)|(438935)|(504175)|(451416)|(636297))\d{0,10})|((5067)|(4576)|(4011))\d{0,12})/,
    jcb        : /^(?:2131|1800|35\d{3})\d{11}/,
    aura      : /^(5078\d{2})(\d{2})(\d{11})$/
};