I found this library many moons ago when looking for a credit card formatting solution. It had so many bugs when I tried it, and it has at least as many now.

I found this library many moons ago when looking for a credit card formatting solution. It had so many bugs when I tried it, and it has at least as many now. For example: in the first demo, type the card number 1234567812345678. Works nice, eh? Now try again with 1233567... oh wait, let me go back and change that second "3" to a "4". And it's broken.