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javascript regex validate Special character
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May 11, 2012 at 10:59 AM

<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 11, 2012 at 10:59 AM

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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