JavaScript RegEx format string containing American Express card number -

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i'm trying format string containing american express credit card number using regular expression. here's i'm using visa, mastercard , discover number formatting, doesn't work american express:

var formatvisamastercarddiscover = function (     number) {     return number.split(/(?=(?:\d{4})+($))/).filter(function (         n) {         return (n != "");     }).join("-"); };

so, i'm curious regular expression amex number be. format should {4}-{6}-{5}. i'd appreciate because couldn't find while searching except how validate not want. want format it.

you can use:

var ccnum = '341256789012345';  var ccfmt = ccnum.replace(/\b(\d{4})(\d{6})(\d{5})\b/, '$1-$2-$3'); //=> 3412-567890-12345

regex demo


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