Sulu\Bundle\MarkupBundle\Markup\MarkupParserInterface::validate PHP Method

    public function validate($content, $locale);

 /**
  * Returns validated content.
  *
  * @param string $content
  * @param string $locale
  *
  * @return string
  */
 private function validate($content, $locale)
 {
     $validation = $this->markupParser->validate($content, $locale);
     $regex = sprintf(self::INVALID_REGEX, $this->markupNamespace, $this->markupNamespace);
     foreach ($validation as $tag => $state) {
         if (false === strpos($tag, 'sulu:validation-state="' . $state . '"')) {
             $newTag = preg_replace($regex, '$1 sulu:validation-state="' . $state . '"$2', $tag);
             $content = str_replace($tag, $newTag, $content);
         }
     }
     return $content;
 }