正则表达式生日验证

Question

I have a regex which validate birthday:

if(!preg_match('/^(0?[1-9]|1[012])[- .\/](0?[1-9]|[12][0-9]|3[01])[- .\/](19|20)?[0-9]{2}$/', $_POST['bday'])
{
    echo 'enter your birthdate in a valid format. mm/dd/yyy';
}

which is:

correct month

leap year date is not accurate

february accepts day 30 & 31

and the year 20 accepts greater than 2013

I only done correct with months how can I do more accurate birthday validation? or there is any alternate way to validate birthday?

my desired output is:

validate leap year date on month of february

year must not greater than 2010

OUTPUT:

02/14/2010

I'm just quite new on regex kindly help?

Answer 1

A regex isn't well-suited for parsing dates. PHP already has built-in functions and classes to do this and you should use that instead. Here's how this can be done using PHP's DateTime class (function by Glavić, from php.net):

function validateDate($date, $format = 'm/d/Y')
{
    $d = DateTime::createFromFormat($format, $date);
    return $d && $d->format($format) == $date && $d->format('Y') <= 2010;
}

For example:

var_dump(validateDate('02/14/2010')); // bool(true)
var_dump(validateDate('02/14/2011')); // bool(false)

Demo!