Sorry if this has been discussed before, did not find anything on a quick search in Issues finder

Now that Luhn algorithm has been added to core, I was wondering if you had plans to add validators for all major credit cards (Visa, MasterCard, Amex, Diners, Discover...)

Most people working on e-commerce need to add these validations and I think it would be great to get them included in core.

Some months ago I did some work on a small pet project at https://github.com/ricardclau/PixelavengersExtraValidatorBundle that includes some major Credit Card validators and some other numbers that can be validated like ES and FR IDs, etc...

If you find this interesting I could work on a PR adding major credit cards... of course they are not much more than a RegExp

Any thoughts? Sorry again if this has been discussed but have not find a issue thread for that apart from Luhn's validator