title: php date validation
body: <p>Im trying to to set up a php date validation (MM/DD/YYYY) but I'm having issues. Here is a sample of what I got:</p>
  
  <pre><code>$date_regex = '%\A(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d\z%'; 
  
  $test_date = '03/22/2010'; 
  if (preg_match($date_regex, $test_date,$_POST['birthday']) ==true) {
      $errors[] = 'user name most have no spaces';`
  </code></pre>