how to change email address in django code example

Example 1: extract email address using expression in django

import re
s = 'Hello from [email protected] to [email protected] about the meeting @2PM'
  
# \S matches any non-whitespace character 
# @ for as in the Email 
# + for Repeats a character one or more times 
lst = re.findall('\S+@\S+', s)
print(lst)
#['[email protected]', '[email protected]']

Example 2: how to login using email in django

from django.contrib.auth import get_user_model
from django.contrib.auth.backends import ModelBackend

class EmailBackend(ModelBackend):
    def authenticate(self, request, username=None, password=None, **kwargs):
        UserModel = get_user_model()
        try:
            user = UserModel.objects.get(email=username)
        except UserModel.DoesNotExist:
            return None
        else:
            if user.check_password(password):
                return user
        return None