[extractor/naver] Improve `_VALID_URL` for `NaverNowIE` (#5620)

Authored by: bashonly

yt_dlp/extractor/naver.py

@@ -254,7 +254,7 @@ class NaverLiveIE(InfoExtractor):
 
 class NaverNowIE(NaverBaseIE):
     IE_NAME = 'navernow'
-    _VALID_URL = r'https?://now\.naver\.com/s/now\.(?P<id>[0-9]+)'
+    _VALID_URL = r'https?://now\.naver\.com/s/now\.(?P<id>\w+)'
     _API_URL = 'https://apis.naver.com/now_web/oldnow_web/v4'
     _TESTS = [{
         'url': 'https://now.naver.com/s/now.4759?shareReplayId=26331132#replay=',
@@ -313,6 +313,9 @@ class NaverNowIE(NaverBaseIE):
             'title': '아이키의 떰즈업',
         },
         'playlist_mincount': 101,
+    }, {
+        'url': 'https://now.naver.com/s/now.kihyunplay?shareReplayId=30573291#replay',
+        'only_matching': True,
     }]
 
     def _extract_replay(self, show_id, replay_id):