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chrome://settings C S Chrome /content/siteDetails?site= https%3A%2F%2Fe-learning.niapune.org.in . Created Date: 12/21/2017 12:06:26 PM Aug 10, 2008 · The credit card gateways will validate the credit card number and expiration date and it may seem to tempting to skip validation and let the gateway deal with it. But keep in mind that every access to the gateway and the front end network costs a little money in transaction charges, so it's a good idea to do as much up front checking as possible. Form Validation - Checking for All Numbers If someone is entering a credit card, phone number, zip code, similar information you want to be able to ensure that the input is all numbers. The quickest way to check if an input's string value is all numbers is to use a regular expression /^[0-9]+$/ that will only match if the string is all numbers and is at least one character long.