javascript - MM/DD 验证。它没有 YYYY 也应该验证 02/30 我也不能

Question

function isMMDD(value) {
    var re = /^([0]?[1-9]|1[0-2])\/([0-2]?[0-9]|3[0-1])$/;
    if (re.test(value)) {
        return true;
    }
    else
        return false;
}

I would like to have 02/30 as invalid too.

Answer 1

信息在here

If you are validating the user's input of a date in a script, it is probably easier to do certain checks outside of the regex. For example, excluding February 29th when the year is not a leap year is far easier to do in a scripting language. It is far easier to check if a year is divisible by 4 (and not divisible by 100 unless divisible by 400) using simple arithmetic than using regular expressions.

在你的情况下它适用同样的事情，这也是一个非常常见的问题。

here , here还有(但不完全是)here