We have a credit card validation on our cart that validates and alerts the user if the card is not valid. Problem is that it alerts the user that the card is invalid but then it allows the user to go to the next page instead of making the user enter a proper credit card number.
The validation used to work just fine, not sure what has happened.
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I have the expreience by using Regular experssion to solve the problem like this. You can send me the page and after finishing it i will send it back to you.