find self tag by regex

     _r = new Regex("<item (.*?)/>");
            foreach (Match m in _r.Matches(_text))
                if (m.Value.ToLower().Contains("

thumb-") || m.Value.ToLower().Contains("pages") || m.Value.ToLower().Contains("replicamap") || (m.Value.Contains("cover.jpg") && !File.Exists(_inputFolderPath + "\\OUTPUT\\OPS\\images\\cover.jpg")) || (m.Value.Contains("cover.xhtml") && !File.Exists(_inputFolderPath + "\\OUTPUT\\OPS\\images\\cover.jpg")))
                    _text = _text.Replace(m.Value, string.Empty);
            _r = new Regex("<itemref (.*?)/>");
            foreach (Match m in _r.Matches(_text))
                if ((m.Value.Contains("cover.xhtml") && !File.Exists(_inputFolderPath + "\\OUTPUT\\OPS\\images\\cover.jpg")))
                    _text = _text.Replace(m.Value, string.Empty);
            _text = _text.Replace("<item id=\"css\" href=\"css/TablesAndFloats.css\" media-type=\"text/css\"/>", "<item id=\"css\" href=\"css/styles.css\" media-type=\"text/css\"/>");
            if (_creator != "")
            {
                _r = new Regex("<dc:creator>(.*?)</dc:creator>");
                if (_r.IsMatch(_text))
                    _text = _text.Replace(_r.Match(_text).Value, "<dc:creator>" + _creator + "</dc:creator>");
            }