old_contents: import re
  
  from streamlink.plugin import Plugin
  from streamlink.plugin.api import http
  from streamlink.plugin.api import useragents
  from streamlink.compat import urljoin
  from streamlink.stream import HLSStream
  
  
  class BritTV(Plugin):
      url_re = re.compile(r"https?://(?:www\.)?brittv\.co.uk/watch/")
      js_re = re.compile(r"""/js/brittv\.player\.js\.php\?key=([^'"]+)['"]""")
      player_re = re.compile(r'''src\s*:\s*(?P<quote>['"])(https?://.+?)(?P=quote)''')
  
      @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, headers={"User-Agent": useragents.CHROME})
          m = self.js_re.search(res.text)
          if m:
              self.logger.debug("Found js key: {0}", m.group(1))
              js_url = m.group(0)
              res = http.get(urljoin(self.url, js_url))
  
              self.logger.debug("Looking for stream URL...")
              for url in self.player_re.findall(res.text):
                  if "adblock" not in url:
                      yield "live", HLSStream(self.session, url)
  
  
  __plugin__ = BritTV
  
new_contents: import re
  
  from streamlink.plugin import Plugin
  from streamlink.plugin.api import http
  from streamlink.plugin.api import useragents
  from streamlink.compat import urljoin
  from streamlink.stream import HLSStream
  
  
  class BritTV(Plugin):
      url_re = re.compile(r"https?://(?:www\.)?brittv\.co.uk/watch/")
      js_re = re.compile(r"""/js/brittv\.player\.js\.php\?key=([^'"]+)['"]""")
      player_re = re.compile(r'''src\s*:\s*(?P<quote>['"])(https?://.+?)(?P=quote)''')
  
      @classmethod
      def can_handle_url(cls, url):
          return cls.url_re.match(url) is not None
  
      def _get_streams(self):
          http.headers.update({"User-Agent": useragents.CHROME})
          res = http.get(self.url)
          m = self.js_re.search(res.text)
          if m:
              self.logger.debug("Found js key: {0}", m.group(1))
              js_url = m.group(0)
              res = http.get(urljoin(self.url, js_url), headers={"Referer": self.url})
  
              self.logger.debug("Looking for stream URL...")
              for _, url in self.player_re.findall(res.text):
                  if "adblock" not in url:
                      yield "live", HLSStream(self.session, url)
  
  
  __plugin__ = BritTV
  
subject: fix issue with stream url extraction, from 7018fc8 (#1625)