positive look ahead is not required, and casuses issues with Python 3.7

src/streamlink/plugin/api/utils.py

@@ -7,7 +7,7 @@
 __all__ = ["parse_json", "parse_xml", "parse_query"]
 
 
-tag_re = re.compile('''(?=<(?P<tag>[a-zA-Z]+)(?P<attr>.*?)(?P<end>/)?>(?:(?P<inner>.*?)</\s*(?P=tag)\s*>)?)''',
+tag_re = re.compile('''<(?P<tag>[a-zA-Z]+)(?P<attr>.*?)(?P<end>/)?>(?:(?P<inner>.*?)</\s*(?P=tag)\s*>)?''',
                     re.MULTILINE | re.DOTALL)
 attr_re = re.compile('''\s*(?P<key>[\w-]+)\s*(?:=\s*(?P<quote>["']?)(?P<value>.*?)(?P=quote)\s*)?''')
 Tag = namedtuple("Tag", "tag attributes text")
@@ -17,7 +17,6 @@ def itertags(html, tag):
     """
     Brute force regex based HTML tag parser. This is a rough-and-ready searcher to find HTML tags when
     standards compliance is not required. Will find tags that are commented out, or inside script tag etc.
-
     :param html: HTML page
     :param tag: tag name to find
     :return: generator with Tags
@@ -26,4 +25,3 @@ def itertags(html, tag):
         if match.group("tag") == tag:
             attrs = dict((a.group("key").lower(), a.group("value")) for a in attr_re.finditer(match.group("attr")))
             yield Tag(match.group("tag"), attrs, match.group("inner"))
-