diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 877879446..bda59e627 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2115,8 +2115,8 @@ def js_to_json(code):
     return re.sub(r'''(?sx)
         "(?:[^"\\]*(?:\\\\|\\['"nurtbfx/\n]))*[^"\\]*"|
         '(?:[^'\\]*(?:\\\\|\\['"nurtbfx/\n]))*[^'\\]*'|
-        /\*[^*]*\*/|,(?=(\s|(/\*[^*]*\*/))*[\]}])|
-        [a-zA-Z_][.a-zA-Z_0-9]*|
+        ,(?=(\s|(/\*((?!\*/)\n|.)*\*/))*[\]}])|
+        /\*((?!\*/)\n|.)*\*/|[a-zA-Z_][.a-zA-Z_0-9]*|
         \b(?:0[xX][0-9a-fA-F]+|0+[0-7]+)(?:\s*:)?|
         [0-9]+(?=\s*:)
         ''', fix_kv, code)