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
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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