Regex verification correct birth date and check age - asp.net

Question

I need a regex which takes the string YYYY-MM-DD-XXXX (The last 4 are just for purpose of gender/area) It's mostly important to check the first 8 Digits for a valid birth date.
So far i have this:
/^([0-9]{4})\-([0-9]{2})\-([0-9]{2})\-([0-9]{4})$/
Also i want to check so the input age is at least 18 years old. Would appreciate if somone had some input on how to achieve this.
Edit: The regex above was tested in JS, but should work fine in ASP as well?

Answer 1

I have changed your regex a bit to make it look more authentic
^([1-2]\d{3})\-([0-1][1-9])\-([0-3][0-9])\-([0-9]{4})$
years like 3012 will not pass.
Now you want to find whether a person is 18 years or not.
One approach could be to find the difference between the years of dates provided like this
var str = '1990-09-12-5555';
var res = /^([1-2]\d{3})\-([0-1][1-9])\-([0-3][0-9])\-([0-9]{4})$/.exec(str);
var year_now = new Date().getFullYear();
console.log(year_now-res[1]);
a second approach will be more precise one :
var str = '1990-09-12-5555';
var res = /^([1-2]\d{3})\-([0-1][1-9])\-([0-3][0-9])\-([0-9]{4})$/.exec(str);
var todays_date = new Date();
var birth_date = new Date(res[1],res[2],res[3]);
console.log(todays_date-birth_date);
will output the result in milliseconds. You can do the math to convert it into year
Cheers , Hope that helps !

Answer 2

I suggest using moment.js which provides an easy to use method for doing this.
interactive demo
function validate(date){
var eighteenYearsAgo = moment().subtract("years", 18);
var birthday = moment(date);
if (!birthday.isValid()) {
return "invalid date";
}
else if (eighteenYearsAgo.isAfter(birthday)) {
return "okay, you're good";
}
else {
return "sorry, no";
}
}
To include moment in your page, you can use CDNJS:
<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.4.0/moment.min.js"></script>
Source

Answer 3

The following will match any year with a valid day/month combination, but won't do validation such as checking you've not entered 31 days for February.
^[0-9]{4}\-(0[1-9]|1[012])\-(0[1-9]|[12][0-9]|3[01])\-[0-9]{4}$
Not sure exactly what you're trying to achieve but I'd suggest using a date library for this sort of thing. You could return a message to the user somehow if the entered date fails to parse into an object.
In order to do age validation, you will certainly need to use a library so a regex should only be used for date validation purposes