Get rid of remaining use of email_re, use validate_email instead

- Legacy-Id: 6882

ietf/liaisons/forms.py

@@ -5,7 +5,7 @@ from django import forms
 from django.conf import settings
 from django.db.models import Q
 from django.forms.util import ErrorList
-from django.core.validators import email_re
+from django.core.validators import validate_email, ValidationError
 from django.template.loader import render_to_string
 
 from ietf.liaisons.accounts import (can_add_outgoing_liaison, can_add_incoming_liaison,
@@ -150,7 +150,9 @@ class LiaisonForm(forms.Form):
         emails = value.split(',')
         for email in emails:
             name, addr = parseaddr(email)
-            if not email_re.search(addr):
+            try:
+                validate_email(addr)
+            except ValidationError:
                 raise forms.ValidationError('Invalid email address: %s' % addr)
 
     def clean_response_contact(self):

ietf/nomcom/utils.py

@@ -16,7 +16,6 @@ from django.core.urlresolvers import reverse
 from django.template.loader import render_to_string
 from django.shortcuts import get_object_or_404
 from django.utils.encoding import smart_str
-from django.core.validators import email_re
 
 from ietf.dbtemplate.models import DBTemplate
 from ietf.person.models import Email, Person