diff --git a/etc/moin/wikiconfig.py b/etc/moin/wikiconfig.py
--- a/etc/moin/wikiconfig.py
+++ b/etc/moin/wikiconfig.py
import socket
import string
import sys
+import re
from MoinMoin.config.multiconfig import DefaultConfig
from MoinMoin.security import Permissions
return 'Please choose another username, your choice was spammy'
if username[0].islower() and username[1].isupper() and len(str(username).translate(null_translate_table, string.ascii_lowercase+string.digits+string.whitespace)) == 2:
return 'Please choose another username, your choice might be spammy'
+ if re.match(r'[a-z]+_[a-z]+[0-9]+',username):
+ return 'Please choose another username, your choice might be spammy'
return None
password_checker = staticmethod(password_checker)
