FeedsHTTPFetcher: how to parse object to get source url?
Ok, I found out a dirty solution to extract an URL from a random string text!

preg_match('#\bhttps?://[^\s()&lt;&gt;]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))#', $row-&gt;node_feeds_item__feeds_source_config, $match);