Youtube Widget & Validator for Symfony

getIdVideo.php

<?php 

  $urls = array(
    '/http:\/\/www.youtube.com\/watch\?v=([a-zA-Z0-9_-]+)([%&=#a-zA-Z0-9_-])*/',
    '/http:\/\/www.youtube.com\/watch#\!v=([a-zA-Z0-9_-]+)([%&=#a-zA-Z0-9_-])*/',
    '/http:\/\/youtu.be\/([a-zA-Z0-9_-]+)/',
  );
  
  $youtube_video_id = preg_replace($urls, '$1', $videoUrl);

validator.php

<?php

class DavidinoValidatorFormYoutube extends sfValidatorRegex
{
  protected function configure($options = array(), $messages = array())
  {
    parent::configure($options, $messages);
    $this->addRequiredOption('pattern');
    $this->addOption('must_match', true);
    $this->addOption('pattern', $this->getPattern());
  }

  /**
   * Returns the current validator's regular expression.
   *
   * @return string
   */
  public function getPattern()
  {
    $pattern = 
      '/http:\/\/www.youtube.com\/watch\?v=([a-zA-Z0-9_-]+)([%&=#a-zA-Z0-9_-])*'.
      '|http:\/\/www.youtube.com\/watch#\!v=([a-zA-Z0-9_-]+)([%&=#a-zA-Z0-9_-])*'.
      '|http:\/\/youtu.be\/([a-zA-Z0-9_-]+)/' ;
      
    return $pattern;
  }

}

widget.php

<?php 

class DavidinoWidgetFormYoutube  extends sfWidgetFormInputText
{
  /**
   * Renders the widget.
   *
   * @param  string $name        The element name
   * @param  string $value       The value displayed in this widget
   * @param  array  $attributes  An array of HTML attributes to be merged with the default HTML attributes
   * @param  array  $errors      An array of errors for the field
   *
   * @return string An HTML tag string
   *
   * @see sfWidgetForm
   */
  public function render($name, $value = null, $attributes = array(), $errors = array())
  {
    $urls = array(
      '/http:\/\/www.youtube.com\/watch\?v=([a-zA-Z0-9_-]+)([%&=#a-zA-Z0-9_-])*/',
      '/http:\/\/www.youtube.com\/watch#\!v=([a-zA-Z0-9_-]+)([%&=#a-zA-Z0-9_-])*/',
      '/http:\/\/youtu.be\/([a-zA-Z0-9_-]+)/',
    );
    $value = preg_replace($urls, 'http://youtu.be/$1', $value);
  
    $tag = '<div>'.link_to(image_tag('http://img.youtube.com/vi/$1/1.jpg', 'alt='), 'http://youtu.be/$1', 'class=yt'). '</div>';
    $count = 0;
    $replaced = preg_replace('/http:\/\/youtu.be\/([a-zA-Z0-9_-]+)/', $tag, $value,-1,$count);
    $html = '';
    
    if($count)
    {
      $html = $replaced;
    }
    
    $html .= parent::render($name, $value, $attributes, $errors);

    return $html;
  }
}