javascript regex validation alphanumeric

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javascript regex validation alphanumeric
2 Answer(s) a year ago
Posted in : JavaScript Questions

How to write javascript regex validation for alphanumeric?

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May 11, 2012 at 10:49 AM

<html>
<head>
<title> alphanumeric validation using regex</title>
<script type="text/javascript">
    function validate() {
        var name = document.getElementById("name").value;
        var pattern = /^[A-Za-z0-9 ]{3,20}$/;
        if (pattern.test(name)) {
            alert(name +" has alphanumeric value");
            return true;
        } else {
            alert("Name is not valid.Please input alphanumeric value!");
            return false;
        }
    }
</script>

</head>
<body>
<h2>Validating Alphanumeric value of textBox..</h2>
Email Id :
<input type="text" name="name" id="name" />
<input type="submit" value="Check" onclick="validate();"/>
</body>
</html>

May 12, 2012 at 1:13 PM

Alphanumeric contains alphabets(A-Z,a-z) and numbers (0-9).So for validation of alphanumeric you have to check the pattern of combination of these two. Sometimes space is also included in it.

In pattern /^[A-Za-z0-9 ]$/

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

^ shows beginning of string.

[..] any letter enclosed with in.

$ is used for ending the string.
test() method takes one argument and check that to the pattern.

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