old_contents: import re
  from streamlink.plugin import Plugin
  from streamlink.plugin.api import http
  from streamlink.stream import HLSStream
  
  class LiveRussia(Plugin):
      url_re = re.compile(r"https?://(?:www.)?live.russia.tv/index/index/channel_id/")
      iframe_re = re.compile(r"<iframe[^>]*src=[\"|']([^'\"]+)[\"|'][^>]*>")
      stream_re = re.compile(r"window.pl.data(.*m3u8\":\"(.*)\"}.*)};")
  
      @classmethod
      def can_handle_url(cls, url):
          return cls.url_re.match(url) is not None
  
      def _get_streams(self):
          res = http.get(self.url)
          iframe_url = re.search(self.iframe_re, res.text).group(1)
          res = http.get(iframe_url)
          stream_url = re.search(self.stream_re, res.text).group(2)
          return HLSStream.parse_variant_playlist(self.session, stream_url)
  
  __plugin__ = LiveRussia
new_contents: import re
  from streamlink.plugin import Plugin
  from streamlink.plugin.api import http
  from streamlink.stream import HLSStream
  
  class LiveRussia(Plugin):
      url_re = re.compile(r"https?://(?:www.)?live.russia.tv/index/index/channel_id/")
      iframe_re = re.compile(r"""<iframe[^>]*src=["']([^'"]+)["'][^>]*>""")
      stream_re = re.compile(r"""window.pl.data.*m3u8":"(.*)"}.*};""")
  
      @classmethod
      def can_handle_url(cls, url):
          return cls.url_re.match(url) is not None
  
      def _get_streams(self):
          res = http.get(self.url)
          iframe_url = self.check_re(self.iframe_re, res.text)
          res = http.get(iframe_url)
          stream_url = self.check_re(self.stream_re, res.text)
          return HLSStream.parse_variant_playlist(self.session, stream_url)
  
      def check_re(self, search, text):
          re_result = re.search(search, text)
          if re_result:
              return re_result.group(1)
          self.logger.error("The requested content is unavailable.")
  
  
  __plugin__ = LiveRussia
subject: Fix review coments