PHP Regex to check date is in YYYY-MM-DD format

Question

I\'m trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I

Answer 1

You could also do it like this:

if (DateTime::createFromFormat('Y-m-d', $date)->format('Y-m-d') === $date) {

    // date is correctly formatted and valid, execute some code

}

This will not only check the format, but also the validity of the date self, since DateTime will create only valid dates and this needs to match the input.