Credit Card Matcher Regex Fn

export function getCardType(value: string) {
    // visa
    const visaRegex = new RegExp('^4[0-9]{12}(?:[0-9]{3})?$');
    if (value.match(visaRegex) != null) return 'Visa';

    // Mastercard
    // Updated for Mastercard 2017 BINs expansion
    const masterCardRegex = new RegExp(
        '^5[1-5][0-9]{14}|^(222[1-9]|22[3-9]\d|2[3-6]\d{2}|27[0-1]\d|2720)[0-9]{12}$'
    );
    if (value.match(masterCardRegex) != null) return 'Mastercard';

    // Discover
    const discoverRegex = new RegExp(
        '^(6011|622(12[6-9]|1[3-9][0-9]|[2-8][0-9]{2}|9[0-1][0-9]|92[0-5]|64[4-9])|65)'
    );
    if (value.match(discoverRegex) != null) return 'Discover';

    const americanExpressRegex = new RegExp('^3[47][0-9]{13}$');
    if (value.match(americanExpressRegex) != null) return 'American Express';

    return '';
}