Validating Email Address Regular Expressions???

abirhasan — Mon, 24 Dec 2012 19:29:54 GMT

Hi,
I am trying to make this regular express for a email validation work, anyone see what might be the problem?

 

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta name="generator" content="HTML Tidy for Linux (vers 1 September 2005), see www.w3.org" />

<script language="javascript">
function checkEmail {
var email = document.getElementById(’emailaddress’);
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (!filter.test(email.value)) {
alert(’Please provide a valid email address’);
email.focus
return false;
}
}
</script>

</head>

<body>

<div>

<form name="emailaddress" id="emailaddress" method="post" action="index.html" onSubmit="return checkEmail();">
<fieldset><legend>What's Your Name</legend>

<table>

<tr>
<td>Email</td>
<td><input class="text" id="emailaddress" name="emailaddress" size="20" /></td>
</tr>

</table>


</fieldset>

<p id="formbuttons"><input type="submit" name="nextb" id="nextb" value=" Next " /> </p>

</form>

</div>

</body>
</html>

Thanks

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Validating Email Address Regular Expressions???