models の CharField に regex の判定を追加
alphanumeric の RegexValidator で追加。
alphanumeric = RegexValidator(r'^[0-9a-zA-Z]*$', 'Only alphanumeric characters are allowed.') name = models.CharField(max_length=50, blank=True, null=True, validators=[alphanumeric]) email = models.EmailField(max_length=50, unique=True, validators=[alphanumeric])
