Regex Validators doesn't validate while working in a shell

[ashish . goyal]

I've configured user's username field in following way

username = models.CharField(
        _('username'),
        max_length=30,
        unique=True,
        help_text=_('Required. 30 characters or fewer. Letters, digits and 
@/./+/-/_ only.'),
        validators=[
            validators.RegexValidator(
                r'^[\w.+-]+$',
                _('Enter a valid username. This value may contain only '
                  'letters, numbers ' 'and ./+/-/_ characters.')
            ),
        ],
        error_messages={
            'unique': _("A user with that username already exists."),
        },
    )

I'm getting error in admin panel but not in django-shell.

<https://lh3.googleusercontent.com/-uPZdWeP7gs4/V9ZJarrUUJI/AAAAAAAAAHM/BmcJvr8IiaIAlbsU7qpmAcGnJN06Ds4KQCLcB/s1600/Screenshot%2Bfrom%2B2016-09-12%2B11%253A49%253A46.png>



<https://lh3.googleusercontent.com/-CJC2lC1ELyc/V9ZJ2eE0jEI/AAAAAAAAAHQ/VB6KOLTs8GcKrTthadl4s9DCwXF5L4p2ACLcB/s1600/Screenshot%2Bfrom%2B2016-09-12%2B11%253A52%253A30.png>


Though django raises an error for maximum length in shell.

Is it a bug? Or am I missing something.

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