diff --git a/youtube_dl/jsinterp.py b/youtube_dl/jsinterp.py
index 9737f7002..d6ae43b94 100644
--- a/youtube_dl/jsinterp.py
+++ b/youtube_dl/jsinterp.py
@@ -243,6 +243,27 @@ class JSInterpreter(object):
 
         return self.build_function(argnames, func_m.group('code'))
 
+    def extract_arguments(self, call):
+        pattern = re.escape(call) if call.endswith(')') else r'%s\s*\(' % re.escape(call)
+        call_m = re.search(pattern, self.code)
+
+        if call_m is None:
+            raise ExtractorError('Could not find JS call %r' % call)
+        # XXX: context-free!
+        close_pos = open_pos = call_m.end()
+        counter = 1
+        while counter > 0:
+            if close_pos > len(self.code):
+                raise ExtractorError('Runaway argument found of JS call %r' % call)
+            c = self.code[close_pos]
+            close_pos += 1
+            if c == '(':
+                counter += 1
+            elif c == ')':
+                counter -= 1
+        else:
+            return self.code[open_pos:close_pos - 1]
+
     def call_function(self, funcname, *args):
         f = self.extract_function(funcname)
         return f(args)
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 9595bcf9f..877879446 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2109,10 +2109,13 @@ def js_to_json(code):
 
         return '"%s"' % v
 
+    # fixing , followed nothing, but comments
+    # fixing unnecessary ? in /\*.*?\*/
+    # fixing greedy comment
     return re.sub(r'''(?sx)
         "(?:[^"\\]*(?:\\\\|\\['"nurtbfx/\n]))*[^"\\]*"|
         '(?:[^'\\]*(?:\\\\|\\['"nurtbfx/\n]))*[^'\\]*'|
-        /\*.*?\*/|,(?=\s*[\]}])|
+        /\*[^*]*\*/|,(?=(\s|(/\*[^*]*\*/))*[\]}])|
         [a-zA-Z_][.a-zA-Z_0-9]*|
         \b(?:0[xX][0-9a-fA-F]+|0+[0-7]+)(?:\s*:)?|
         [0-9]+(?=\s*:)