[jsinterp] Allow digits in function names

youtube_dl/jsinterp.py

@@ -114,13 +114,13 @@ class JSInterpreter(object):
         obj = {}
         obj_m = re.search(
             (r'(?:var\s+)?%s\s*=\s*\{' % re.escape(objname)) +
-            r'\s*(?P<fields>([a-zA-Z$]+\s*:\s*function\(.*?\)\s*\{.*?\})*)' +
+            r'\s*(?P<fields>([a-zA-Z$0-9]+\s*:\s*function\(.*?\)\s*\{.*?\})*)' +
             r'\}\s*;',
             self.code)
         fields = obj_m.group('fields')
         # Currently, it only supports function definitions
         fields_m = re.finditer(
-            r'(?P<key>[a-zA-Z$]+)\s*:\s*function'
+            r'(?P<key>[a-zA-Z$0-9]+)\s*:\s*function'
             r'\((?P<args>[a-z,]+)\){(?P<code>[^}]+)}',
             fields)
         for f in fields_m: