CODE EXAMPLE FOR JAVASCRIPT

alert react native

function getCardType (number) {
  const numberFormated = number.replace(/D/g, '')
  var patterns = {
    VISA: /^4[0-9]{12}(?:[0-9]{3})?$/,
    MASTER: /^5[1-5][0-9]{14}$/,
    AMEX: /^3[47][0-9]{13}$/,
    ELO: /^((((636368)|(438935)|(504175)|(451416)|(636297))d{0,10})|((5067)|(4576)|(4011))d{0,12})$/,
    AURA: /^(5078d{2})(d{2})(d{11})$/,
    JCB: /^(?:2131|1800|35d{3})d{11}$/,
    DINERS: /^3(?:0[0-5]|[68][0-9])[0-9]{11}$/,
    DISCOVERY: /^6(?:011|5[0-9]{2})[0-9]{12}$/,
    HIPERCARD: /^(606282d{10}(d{3})?)|(3841d{15})$/,
    ELECTRON: /^(4026|417500|4405|4508|4844|4913|4917)d+$/,
    MAESTRO: /^(5018|5020|5038|5612|5893|6304|6759|6761|6762|6763|0604|6390)d+$/,
    DANKORT: /^(5019)d+$/,
    INTERPAYMENT: /^(636)d+$/,
    UNIONPAY: /^(62|88)d+$/,
  }
  for (var key in patterns) {
    if (patterns[key].test(numberFormated)) {
      return key
    }
  }
}

console.log(getCardType("4539 5684 7526 2091"))
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