fix example re such that the listen modifier example works

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/sqlalchemy/orm/events.py b/lib/sqlalchemy/orm/events.py
index 992f29623..6bb773536 100644
--- a/lib/sqlalchemy/orm/events.py
+++ b/lib/sqlalchemy/orm/events.py
@@ -1812,7 +1812,7 @@ class AttributeEvents(event.Events):
         def validate_phone(target, value, oldvalue, initiator):
             "Strip non-numeric characters from a phone number"
 
-            return re.sub(r'(?![0-9])', '', value)
+            return re.sub(r'\D', '', value)
 
         # setup listener on UserContact.phone attribute, instructing
         # it to use the return value