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<!DOCTYPE html>
<html>
<head>
    <title>Registration Form</title>
    <script>
        function validateForm() {
            var name = document.forms["registrationForm"]["name"].value;
            var email = document.forms["registrationForm"]["email"].value;
            var password = document.forms["registrationForm"]["password"].value;
            
            if (name == "") {
                alert("Name must be filled out");
                return false;
            }
            
            if (email == "") {
                alert("Email must be filled out");
                return false;
            } else if (!isValidEmail(email)) {
                alert("Invalid email address");
                return false;
            }
            
            if (password == "") {
                alert("Password must be filled out");
                return false;
            } else if (password.length < 8) {
                alert("Password must be at least 8 characters long");
                return false;
            }
            
            return true;
        }
        
        function isValidEmail(email) {
            var emailPattern = /^\w+@[a-zA-Z_]+\.[a-zA-Z]{2,3}$/;
            return emailPattern.test(email);
        }
    </script>
</head>
<body>
    <h2>Registration Form</h2>
    <form name="registrationForm" onsubmit="return validateForm()" method="post">
        Name: <input type="text" name="name"><br><br>
        Email: <input type="text" name="email"><br><br>
        Password: <input type="password" name="password"><br><br>
        <input type="submit" value="Register">
    </form>
</body>
</html>