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Activetuts on 01/04/11

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# Validate Card Number with RegExp

/ Published in: ActionScript 3
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From the tutorial, Validating Various Input Data in Flash (http://active.tutsplus.com/tutorials/actionscript/validating-various-input-data-in-flash/)

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`public function validateCardNumber(ccNumber:String):Boolean{    var americanExpress:RegExp  = /^(34|37) ([0-9]{13})\$/x;    var dinnersClub:RegExp      = /^(30[0-5]) ([0-9]{13})\$/x;    var masterCard:RegExp       = /^(5[1-5]) ([0-9]{14})\$/x;    var visa:RegExp             = /^4 ([0-9]{12} | [0-9]{15})\$/x;    var valid:Boolean;    ccNumber = ccNumber.match(/\d/g).join('');     if (americanExpress.test(ccNumber) || dinnersClub.test(ccNumber) ||        masterCard.test(ccNumber) || visa.test(ccNumber))        valid = true;     return valid && luhnChecksum(ccNumber);} public function luhnChecksum(number:String):Boolean{    var digits:Array = number.split('');    var start:uint = (number.length % 2 == 0) ? 0:1;    var sum:int;     while (start < digits.length)    {        digits[start] = uint(digits[start]) * 2;        start += 2;    }     digits = digits.join('').split('');     for (var i:uint = 0; i < digits.length; i++)    {        sum += uint(digits[i]);    }    return (sum % 10 == 0);}`