public static function get_res_file($content)
{
//<img src="{@res_id=3}"
$matched = preg_match('/<img\\ssrc="{@res_id=(?P<resId>\\d+)}">/', $content, $matches);
if ($matched) {
$res = UploadedRes::find($matches["resId"]);
return $res->filename;
}
return null;
}
