Update admin user settings

app/auth/__init__.py

@@ -1,8 +1,5 @@
 from flask import Blueprint
 
 
-USERNAME_REGEX = '^[A-Za-zÄÖÜäöüß0-9_.]*$'
-
-
 bp = Blueprint('auth', __name__)
 from . import routes

app/auth/forms.py

@@ -8,7 +8,6 @@ from wtforms import (
 from wtforms.validators import InputRequired, Email, EqualTo, Length, Regexp
 from app.forms import NopaqueForm
 from app.models import User
-from . import USERNAME_REGEX
 
 
 class RegistrationForm(NopaqueForm):
@@ -22,7 +21,7 @@ class RegistrationForm(NopaqueForm):
             InputRequired(),
             Length(max=64),
             Regexp(
-                USERNAME_REGEX,
+                User.username_pattern,
                 message=(
                     'Usernames must have only letters, numbers, dots or '
                     'underscores'