Question

I want to validate the date format YYYY-MM-DDin PHP. But something is wrong and I can’t find it? The regular expression keeps telling me the format is wrong, when it is right.

$datePattern = '/^(2[0-9][0-9][0-9])\-(0[1-9]|1[0-2]])\-(0[1-9]|1[0-9]|2[0-9]|3[0-1])$/';  
$date = '2011-11-05';
if(!preg_match($datePattern,$date)){
    die('Wrong format in date!');
}

Answer 1

You have an extra ] in your regular expression (month subexpression) that is not needed. So it should be

^(2[0-9][0-9][0-9])\-(0[1-9]|1[0-2])\-(0[1-9]|1[0-9]|2[0-9]|3[0-1])$