JavaScript Tutorial/Regular Expressions/EMail

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Checking an email address - Version 01

<html>
<head>
<title>Checking an email address - Version 01</title>
<script type="text/javascript" language="javascript">
<!-- //
function IsMatchingAddress(str){
    var myRegExp = /[a-z0-9-]{1,30}@[a-z0-9-]{1,65}.[a-z]{3}/ ;
    return myRegExp.test(str)
}
function TestGuess(){
var EmailAddr = "asdf@asdf.net".toLowerCase();
alert(IsMatchingAddress(EmailAddr));
}
// -->
</script>
</head>
<body>
<h3>This page allows you to enter and check
 an email address such as asdf@wbex.ru.ru</h3>
<form>
<button type="Button" onclick="TestGuess()">
Click here to enter email address</button>
</form>
</body>
</html>


Checking an email address - Version 02

<html>
<head>
<title>Checking an email address - Version 02</title>
<script type="text/javascript" language="javascript">
<!-- //
function IsMatchingAddress(str){
    var myRegExp = /[a-z0-9-.]{1,30}@[a-z0-9-]{1,65}.(com|net|org|info|biz|([a-z]{2,3}.[a-z]{2}))/ ;
    return myRegExp.test(str)
}
function TestGuess(){
    var EmailAddr = "asdf@wbex.ru".toLowerCase();
    alert(IsMatchingAddress(EmailAddr));
}
// -->
</script>
</head>
<body>
<h3>This page allows you to enter and check an email address
 such as asdf@wbex.ru,</h3>
<form>
<button type="Button" onclick="TestGuess()">
Click here to enter email address</button>
</form>
</body>
</html>


Use Regular expression to validate the Email

<html>
<head>
<title>E-mail Example</title>
<script type="text/javascript">
    function isValidEmail(sText) {
        var reEmail = /^(?:\w+\.?)*\w+@(?:\w+\.)+\w+$/;
        return reEmail.test(sText);
    }
    function validate() {
        var oInput1 = document.getElementById("txt1");
        if (isValidEmail(oInput1.value)) {
            alert("Valid");
        } else {
            alert("Invalid!");
        }
    }
</script>
</head>
<body>
    <P>E-mail Address: <input type="text" id="txt1" /><br />
    <input type="button" value="Validate" onclick="validate()" /></p>
</body>
</html>
Источник — «http://wbex.ru/index.php?title=JavaScript_Tutorial/Regular_Expressions/EMail&oldid=9873»