[extractors] Use new framework for existing embeds (#4307)

`Brightcove` is difficult to migrate because it's subclasses may depend
on the signature of the current functions. So it is left as-is for now

Note: Tests have not been migrated

yt_dlp/extractor/wimtv.py

@@ -1,5 +1,3 @@
-import re
-
 from .common import InfoExtractor
 from ..utils import (
     determine_ext,
@@ -20,6 +18,7 @@ class WimTVIE(InfoExtractor):
         )
         (?P<type>vod|live|cast)[=/]
         (?P<id>%s).*?)''' % _UUID_RE
+    _EMBED_REGEX = [rf'<iframe[^>]+src=["\'](?P<url>{_VALID_URL})']
     _TESTS = [{
         # vod stream
         'url': 'https://platform.wim.tv/embed/?vod=db29fb32-bade-47b6-a3a6-cb69fe80267a',
@@ -54,14 +53,6 @@ class WimTVIE(InfoExtractor):
         'only_matching': True,
     }]
 
-    @staticmethod
-    def _extract_urls(webpage):
-        return [
-            mobj.group('url')
-            for mobj in re.finditer(
-                r'<iframe[^>]+src=["\'](?P<url>%s)' % WimTVIE._VALID_URL,
-                webpage)]
-
     def _real_initialize(self):
         if not self._player:
             self._get_player_data()