I have a IntegerField, where I want the input to only accept a value of 11 digits/numbers.

I have tried to make a regex validator on the field, but my problem is when I try to make a model form with the field. I only get a validation-error if the value is 10 digits or less, but if I try a value with 12 digits and upwards, I don't get any validation error. 

Here is my model field:

```
number =  models.IntegerField(max_length=11, validators=[RegexValidator(r'\d{11,11}','Number must be 11 digits','Invalid number')])

```

How can I make it so I get a validation error if the value is more than 11 digits?