use re2 instead of re to avoid ReDOS attack

app/alias_utils.py

@@ -1,4 +1,4 @@
-import re
+import re2 as re
 from typing import Optional
 
 from email_validator import validate_email, EmailNotValidError

app/dashboard/views/domain_detail.py

@@ -1,4 +1,4 @@
-import re
+import re2 as re
 from threading import Thread
 
 from flask import render_template, request, redirect, url_for, flash

app/dashboard/views/referral.py

@@ -1,4 +1,4 @@
-import re
+import re2 as re
 
 from flask import render_template, request, flash, redirect, url_for
 from flask_login import login_required, current_user

app/email_utils.py

@@ -4,7 +4,7 @@ import enum
 import os
 import quopri
 import random
-import re
+import re2 as re
 import time
 import uuid
 from copy import deepcopy

app/spamassassin_utils.py

@@ -2,7 +2,7 @@
 https://github.com/petermat/spamassassin_client
 """
 import logging
-import re
+import re2 as re
 import select
 import socket
 from io import BytesIO