AttributeError: module 'django.db.models' has no attribute 'RegexField'. python (django)

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I want add RegexField but i have this error. why? found it on Google but there is nothing on regexfield

this is error

mob = models.RegexField(regex=r'^+?1?\d{9,15}$') AttributeError: module 'django.db.models' has no attribute 'RegexField'

models.py 

from django.contrib.auth.models import AbstractUser, BaseUserManager
from django.db import models
from django.utils.translation import ugettext_lazy as _
from django import forms


class UserManager(BaseUserManager):
    """Define a model manager for User model with no username field."""

    use_in_migrations = True

    def _create_user(self, email, password, **extra_fields):
        """Create and save a User with the given email and password."""
        if not email:
            raise ValueError('The given email must be set')
        email = self.normalize_email(email)
        user = self.model(email=email, **extra_fields)
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_user(self, email, password=None, **extra_fields):
        """Create and save a regular User with the given email and password."""
        extra_fields.setdefault('is_staff', False)
        extra_fields.setdefault('is_superuser', False)
        return self._create_user(email, password, **extra_fields)

    def create_superuser(self, email, password, **extra_fields):
        """Create and save a SuperUser with the given email and password."""
        extra_fields.setdefault('is_staff', True)
        extra_fields.setdefault('is_superuser', True)

        if extra_fields.get('is_staff') is not True:
            raise ValueError('Superuser must have is_staff=True.')
        if extra_fields.get('is_superuser') is not True:
            raise ValueError('Superuser must have is_superuser=True.')

        return self._create_user(email, password, **extra_fields)


class User(AbstractUser):
    """User model."""

    username = None
    email = models.EmailField(_('email address'), unique=True)
    mob = models.RegexField(regex=r'^\+?1?\d{9,15}$')


    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = UserManager()
django-3.0 django-forms django-models django python
1 Answers

A RegexField [Django-doc] is a form field. You can use it in a form to validate text before you for example store it in a model, but not in a model.

What you can do is add a RegexValidator [Django-doc] as validator to your model field:

from django.core.validators import RegexValidator

class User(AbstractUser):
    """User model."""

    username = None
    email = models.EmailField(_('email address'), unique=True)
    mob = models.CharField(
        max_length=17,
        validators=[RegexValidator(r'^\+?1?\d{9,15}$')]
    )


    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = UserManager()

As of django-2.2 you can also make use of the constraint framework [Django-doc] to validate constraints at the database layer. Not all databases per se check constraints, so it is not guaranteed to validate it at the database layer. You can define a constraint with:

from django.db.models import Q
from django.core.validators import RegexValidator

class User(AbstractUser):
    """User model."""

    username = None
    email = models.EmailField(_('email address'), unique=True)
    mob = models.CharField(
        max_length=17,
        validators=[RegexValidator(r'^\+?1?\d{9,15}$')]
    )


    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

    objects = UserManager()

    class Meta:
        constraints = [
            models.CheckConstraint(
                check=Q(mob__regex=r'^\+?1?\d{9,15}$'),
                name='mob_valid'
            ),
        ]

You can also define a form with RegexField, although if you add a validator that is not necessary. For example in a form you can add:

from django import forms

class UserForm(forms.ModelForm):
    mob = forms.RegexField(regex=r'^\+?1?\d{9,15}$')

    class Meta:
        model = User
        fields = '__all__'
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