Django: phone number (JP)

django_phone_jp.py

from django.core.validators import ValidationError  # type: ignore[attr-defined]
from django.core.validators import RegexValidator


## validators.py
phone_number_validator = RegexValidator(
    regex=r"^[0-9-()+ ]{9,20}$", message="入力可能文字は半角の、数字、ハイフン、括弧のみ. 9文字以上, 20文字以下."
)

## models.py
class MyModel(Model):
    phone = models.CharField(
        "電話番号",
        max_length=20,
        validators=[
            MinLengthValidator(9),
            MaxLengthValidator(20),
            phone_number_validator,
        ],
        default=None,
    )