remove extra zero
diff --git a/Lib/re.py b/Lib/re.py
index 3934f49..aab5d37 100644
--- a/Lib/re.py
+++ b/Lib/re.py
@@ -199,7 +199,7 @@
     return _compile(pattern, flags|T)
 
 _alphanum = frozenset(
-    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890")
+    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
 
 def escape(pattern):
     "Escape all non-alphanumeric characters in pattern."