This works for java's regular expression parser.
^\d{15}+$|^(\d{4}\s){3}+\d{4}$|^(\d{4}\-){3}+\d{4}$
This translates as
^\d{15}+$ exactly 15 digits
| or
^(\d{4}\s){3}+\d{4}$ the string starts with exactly 3 groups of 4
digits followed by a white space char followed by 4 digits
| or
^(\d{4}\-){3}+\d{4}$ the string starts with exactly 3 groups of 4
digits followed by a '-' char followed by 4 digits
> Date: Tue, 9 Sep 2008 03:40:03 -0300
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: [rails-development] Active Record homework regex
>
>
> Hi,
>
> Can someone give me a hand on the validation of the credit card format
> for the homework of the Active Record lesson?
> It says:
> # User can enter the credit card format in the following format. The
> x has to be numeric value.
> * xxxx-xxxx-xxxx-xxxx (format #1)
> * xxxx xxxx xxxx xxxx (format #2)
> * xxxxxxxxxxxxxxxx (format #3)
> If someone could write the regex for it nicely that would be very helpful.
>
> Regards,
> Vanessa
>
> >
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