Zau4man

array(
			'pattern'   => '/^forum\/first-post$/i',
			'action'    => 'first_post_view_ajax'
		),

array(
			'pattern'   => '/^forum\/thread([0-9]+)-([0-9]).html$/i',
			'action'    => 'thread_redirect',
			1           => 'thread_id',
			2           => 'page'
		),

<?php
 
class actionForumThreadRedirect extends cmsAction {
 
	public function run(){
 
                $thread_id = $this->request->get('thread_id', '');
		$page = $this->request->get('page', '');
 
 
 
		if (!$thread_id){ cmsCore::error404(); }
 
		// получаем данные по теме форума
		$thread = $this->model->getThread($thread_id);
		if (!$thread){ cmsCore::error404(); }
 
                // получаем данные категории
		$category = $this->model->getCatById($thread['category_id']);
		if (!$category){ cmsCore::error404(); }
 
 
                if($page>1){
		$this->redirect(href_to('forum', '', array(
                    $category['slug'],$thread['slug'],$page
                )),301);
                }else{
                $this->redirect(href_to('forum', '', array(
                    $category['slug'],$thread['slug']
                )),301); 
                }
 
	}
}

 
preg_match_all('/\/go\/url=(.*?)\"/is', $text, $matches);
$text = str_replace('/redirect?url=', '/redirect?url=', $text);
foreach ($matches[1] as $match){
    $url = str_replace(array('--q--',' '), array('?','+'), $match);
    if(mb_strpos($url, '-') === 0){
        $url = htmlspecialchars_decode(base64_decode(ltrim($url, '-')));
    }
    $text = str_replace($match, $url, $text);   
}