[utils] Improve `js_to_json` comment regex

Capture the newline character as part of a single-line comment

From #497, Authored by: fstirlitz

test/test_utils.py

@@ -1054,6 +1054,9 @@ class TestUtil(unittest.TestCase):
         on = js_to_json('{ "040": "040" }')
         self.assertEqual(json.loads(on), {'040': '040'})
 
+        on = js_to_json('[1,//{},\n2]')
+        self.assertEqual(json.loads(on), [1, 2])
+
     def test_js_to_json_malformed(self):
         self.assertEqual(js_to_json('42a1'), '42"a1"')
         self.assertEqual(js_to_json('42a-1'), '42"a"-1')

yt_dlp/utils.py

@@ -4365,7 +4365,7 @@ def strip_jsonp(code):
 
 def js_to_json(code, vars={}):
     # vars is a dict of var, val pairs to substitute
-    COMMENT_RE = r'/\*(?:(?!\*/).)*?\*/|//[^\n]*'
+    COMMENT_RE = r'/\*(?:(?!\*/).)*?\*/|//[^\n]*\n'
     SKIP_RE = r'\s*(?:{comment})?\s*'.format(comment=COMMENT_RE)
     INTEGER_TABLE = (
         (r'(?s)^(0[xX][0-9a-fA-F]+){skip}:?$'.format(skip=SKIP_RE), 16),