title: PHP Date format question
body: <p>Some folks helped me on 
  <a href="https://stackoverflow.com/questions/3326316/how-to-check-the-data-format-in-php">How to check the data format in PHP</a>
   post but I need to check two date formats MM-DD-YYYY and DD-MM-YY instead of one. Do I need to setup two regular expression???? Thanks for the help!!!</p>
  
  <pre><code>$date1=05/25/2010;    
  $date2=25/05/10;    //I wish both of them would pass 
  
  $date_regex = '!^(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)\d\d$!';
  
  if (preg_match($date_regex, $date1)) {
    do something    
  }
  
  if (preg_match($date_regex, $date2)) {  // need second Reg. expression??
    do something    
  }
  </code></pre>