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JavaScript regex validate validate Zip.
2 Answer(s) a year ago
Posted in : JavaScript Questions

JavaScript regex validate - how to validate Zip?

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May 12, 2012 at 1:34 PM

<html>
<head>
<title>Zip Code validation using regex</title>
<script type="text/javascript">
    function validate() {
        var zip = document.getElementById("zip").value;
        var pattern = /^\d{5}([\-]\d{4})?$/;
        if (pattern.test(zip)) {
            alert("Your Zip Code : "+zip);
            return true;
        } 
            alert("It is not valid zip code !");
            return false;

    }
</script>

</head>
<body>
<h2>Validating Zip Code..</h2>
Enter Zip Code :
<input type="text" name="zip" id="zip" />
<input type="submit" value="Check" onclick="validate();" />
</body>
</html>

May 12, 2012 at 1:36 PM

The above example validate 5 digit (eg-12344) or 5 digit-4 digit (eg- 12345-2323) zip code

by using regular expression- /^\d{5}([-]\d{4})?$/

Here /../(forward slashes) is used to quote your regular expression.

^ shows beginning of string.

\d{5} is for any digit 0-9 having 5 places.

() is used for grouping content.

[-] is used to put -.

\d{4} having sequence of digits of 4 places.

$ is used for ending the string.

test() method takes one argument and check that to the pattern.

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