Find duplicates with regex

I posted this question to stackover flow but didn't get a good answer: http://stackoverflow.com/questions/28080545/django-find-duplicates-with-queryset-and-regex

I want to find duplicates in db fields with a regex.

I know I can use this to find duplicates:
self.values('Website').annotate(count=Count('id')).order_by().filter(count__gt=1)

I have a model like this:
class company(models.Model):
   Website = models.URLField(blank=True, null=True )

The problem is that www and non-www websites are marked as different websites.  I want some thing that will return duplicates where it realizes www and non-www are the same website.

I know I can use a regex like this for www and non-www:
Website__iregex='http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+'

Here is an example:
Company.objects.create(Website='http://example.com')
Company.objects.create(Website='http://www.example.com')
Company.objects.create(Website='http://example.org', Name='a')
Company.objects.create(Website='http://example.org', Name='b')

When I call: Company.objects.all().values('Website').annotate(count=Count('id')).order_by().filter(count__gt=1)

It returns:
1.  http://example.org (from name=a) and http://example.org (from name=b)

This is missing that example.com and www.example.com are the same website and duplicates.

I want to use a regex so that I can tell django that example.com and www.example.com are the same websites.

I want the return to be:
1.  http://example.org (from name=a) and http://example.org (from name=b)
2.  example.com www.example.com
   

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