title: PHP Regex to check date is in YYYY-MM-DD format
body: <p>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 have setup.</p>
  
  <p>So I'm assuming I have made a mess of the regex, detailed below.</p>
  
  <pre><code>$date="2012-09-12";
  
  if (preg_match("^[0-9]{4}-[0-1][0-9]-[0-3][0-9]$",$date))
      {
          return true;
      }else{
          return false;
      }
  </code></pre>
  
  <p>Any thoughts?</p>