日期正则表达式未返回真

Question

For some reason this is always returning false... when entering "2014 12 12" into the form. It is this format to enter into a database.

$date = trim($_POST['date']);

in my library.php i have :

function validateDate($date) {
    if(preg_match('/^[0-9]{2,4}[\-[[:space:]]]{1}[0-9]{1,2}[\-[[:space:]]]{1}[0-9]{1,2}$/',$date)){
        return true;
    }
    else{
        return false;       
    }
}

and in my php i have :

if (validateDate($date)){
    $dateCSS = 'style="border-color: #98faad;"';
}
else {
    $dateCSS = 'style="border-color: red;"';
    $flag = false;
}

Answer 1

试试这个正则表达式：

^[0-9]{2,4}[\-[:space:]]{1}[0-9]{1,2}[\-[:space:]]{1}[0-9]{1,2}$

Answer 2

A more reliable way to validate a date is to use the datetime extension .

function validateDate($date, $format = 'Y d m') {
    return \DateTime::createFromFormat($format, $date) !== false;
}

This way you do not have to resort to using regular expressions, and you will be able to actually validate dates correctly (for example, something like 2014 12 51 will not validate).

if ( ! validateDate('2014 12 51')) {
    echo 'Not valid!';
}

It will also allow you to validate more complicated dates, if you will be required to do that some day:

if (validateDate('16th September 2014', 'dS F Y')) {
    echo 'Valid!';
}

For the $format argument you must use the formatting options that DateTime::createFromFormat() accepts.