验证各种东东的javascript正则表达式代码

验证电邮： /^(?:/w+/.?)*/w+@(?:/w+/.?)*/w+$/

验证信用卡号：mastercard: /^(5[1-5]/d{2})[/s/-]?(/d{4})[/s/-]?(/d{4})[/s/-]?(/d{4})[/s/-]?(/d{4})$/

visacard: /^(4/d{12}(?:/d{3})?)$/

验证信用卡号是不是唯一的：




function luhnCheckSum(cardNum) ...{




var oddSum = 0, evenSum = 0, isOdd = true;






for (var i = cardNum.length - 1; i >= 0; i--) ...{




var num = parseInt(cardNum.charAt(i));






if (isOdd) ...{




oddSum += num;






} else ...{




num = num * 2;






if (num > 9) ...{


num = eval( num.toString().split("").join("+"));




}


evenNum += num;


}




isOdd = !isOdd;


}




return ((evenNum + oddSum) % 10 == 0);


}

验证日期（欧洲型）： /(?:0[1-9]|[12][0-9]|3[01])//(?:0[1-9]|1[0-2])//(?:19|20/d{2})/