django alphanumeric validator not work -


i try force user use alphanumeric characters in

field wrote following code in user model:

alphanumeric = regexvalidator(r'^[0-9a-za-z]*$', message='only alphanumeric characters allowed.')  username = models.charfield(unique=true, max_length=20, validators=[alphanumeric])

but still can create:

user.objects.create(username="@@")

i don't want create it...

am doing wrong? did wrote wrong regex validator?

i think code should this:

username = models.charfield(unique=true, max_length=20,      validators=[         regexvalidator(             r'^[0-9a-za-z]*$',              message='only alphanumericcharacters allowed.',             code='invalid_username'         )     ] )

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