[Django]-Django REST Framework validation error: 'Enter a valid URL.'

If you have your own regex, why not just use a models.CharField instead of URLField? Like:

models.py

phone_regex = RegexValidator(
    regex=r'^\+?(?:\(?[0-9]\)?\x20?){4,14}[0-9]$',
    message="Error....")

class FooModel(models.Model):
    phone = models.CharField("Phone Number", validators=[
                         phone_regex], max_length=26, blank=True, null=True)

BTW, to customize URLValidator accept urls without ‘http/https’ I use below

models.py

class OptionalSchemeURLValidator(URLValidator):
    def __call__(self, value):
        if '://' not in value:
            # Validate as if it were http://
            value = 'http://' + value
        super(OptionalSchemeURLValidator, self).__call__(value)

class FooModel(models.Model):
        website = models.CharField(max_length=200, validators=[OptionalSchemeURLValidator()])

This doesn’t change the uploaded value, just make the validation pass.
I tried on my DRF, it works.

refer to Alasdair’s answer, thanks Alasdair