Usability „Pearl“

I just found this usability pearl:

After entering a credit card number as usual with spaces between the groups of four digits, the web page complained like this:

Credit Card Number without Spaces

Web page of insisting to refill a form because of spaces

Yes, it is easy to allow spaces. Just match the following regex
/^\s*\d{4}\s*\d{4}\s*\d{4}\s*\d{4}\s*$/
and then remove the spaces when processing it, but do not let the user enter the number without spaces. That is just ridiculous.

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