ZIP Code (US Postal Code) validation

benc_2910 0
Viewed 238552

I thought people would be working on little code projects together, but I don't see them, so here's an easy one:

Code that validates a valid US Zip Code. I know there are ZIP code databases out there, but there are still uses, like web pages, quick validation, and also the fact that zip codes keep getting issued, so you might want to use weak validation.

I wrote a little bit about zip codes in a side project on my wiki/blog:

https://benc.fogbugz.com/default.asp?W24

There is also a new, weird type of zip code.

https://benc.fogbugz.com/default.asp?W42

I can do the javascript code, but it would be interesting to see how many languages we can get here.

validation javascript
13 Answers

Javascript Regex Literal:

US Zip Codes: /(^\d{5}$)|(^\d{5}-\d{4}$)/

var isValidZip = /(^\d{5}$)|(^\d{5}-\d{4}$)/.test("90210");

Some countries use Postal Codes, which would fail this pattern.

keparo_194680 
function isValidUSZip(sZip) {
   return /^\d{5}(-\d{4})?$/.test(sZip);
}
user_107280

Here's a JavaScript function which validates a ZIP/postal code based on a country code. It allows somewhat liberal formatting. You could add cases for other countries as well. Note that the default case allows empty postal codes since not all countries use them.

function isValidPostalCode(postalCode, countryCode) {
    switch (countryCode) {
        case "US":
            postalCodeRegex = /^([0-9]{5})(?:[-\s]*([0-9]{4}))?$/;
            break;
        case "CA":
            postalCodeRegex = /^([A-Z][0-9][A-Z])\s*([0-9][A-Z][0-9])$/;
            break;
        default:
            postalCodeRegex = /^(?:[A-Z0-9]+([- ]?[A-Z0-9]+)*)?$/;
    }
    return postalCodeRegex.test(postalCode);
}

FYI The second link referring to vanity ZIP codes appears to have been an April Fool's joke.

user_149340

Are you referring to address validation? Like the previous answer by Mike, you need to cater for the othe 95%.

What you can do is when the user select's their country, then enable validation. Address validation and zipcode validation are 2 different things. Validating the ZIP is just making sure its integer. Address validation is validating the actual address for accuracy, preferably for mailing.

user_236670

To allow a user to enter a Canadian Postal code with lower case letters as well, the regex would need to look like this:

/^([a-zA-Z][0-9][a-zA-Z])\s*([0-9][a-zA-Z][0-9])$/

Admin1
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