card_types = [
      {
        name: 'amex',
        range: '34,37',
        valid_length: [15]
      }, {
        name: 'diners_club_carte_blanche',
        range: '300-305',
        valid_length: [14]
      }, {
        name: 'diners_club_international',
        range: '36',
        valid_length: [14]
      }, {
        name: 'jcb',
        range: '3528-3589',
        valid_length: [16]
      }, {
        name: 'laser',
        range: '6304, 6706, 6709, 6771',
        valid_length: [16, 17, 18, 19]
      }, {
        name: 'visa_electron',
        range: '4026, 417500, 4508, 4844, 4913, 4917',
        valid_length: [16]
      }, {
        name: 'visa',
        range: '4',
        valid_length: [13, 14, 15, 16, 17, 18, 19]
      }, {
        name: 'mastercard',
        range: '51-55,2221-2720',
        valid_length: [16]
      }, {
        name: 'discover',
        range: '6011, 622126-622925, 644-649, 65',
        valid_length: [16]
      }, {
        name: 'dankort',
        range: '5019',
        valid_length: [16]
      }, {
        name: 'maestro',
        range: '50, 56-69',
        valid_length: [12, 13, 14, 15, 16, 17, 18, 19]
      }, {
        name: 'uatp',
        range: '1',
        valid_length: [15]
      }
    ];