add_event_handler('loc_end_index_thumbnails', 'user_collections_form');

function user_collections_form($tpl_thumbnails_var)
{
    global $template;
    $template->set_prefilter('index_thumbnails', 'user_collections_form_prefilter');
    return $tpl_thumbnails_var;
}

function user_collections_form_prefilter($content, &$smarty)
{
    $replace = file_get_contents(USER_COLLEC_PATH.'template/uc_form_add.tpl');
    $search = '/({foreach from=\$thumbnails item=thumbnail}).*({\/foreach})/is';
    return preg_replace($search, $replace, $content);
}


The add_event_handler is before the two set_prefilter already mentioned. I would like to get it to replace the whole foreach section of the thumbnails.tpl Figured that would be the easiest way to set it up as a form instead of doing multiple search replace. The search regex appears to work on the tumbnails.tpl itself, but it could be an issue of when it occurs?