Whenever I click register it says, "your file was not found" and alerts are not showing

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    <!DOCTYPE html>
    <html>
    
    <head></head>
    
    <body>
        <form name="myForm" action="/action_page.php" method="post" onsubmit="return Function()">E-mail:
            <input type="text" id="email" name="email">
            <br>Password:
            <input type="password" id="password" name="password">
            <br>Repeat Password:
            <input type="password" id="password2" name="password2">
            <br>
            <input type="submit" value="Register">
        </form>
        <script type="text/javascript">
            function Function() {
            
            var email = document.getElementById ("email").value;
            var password = document.getElementById("password").value;
            var password2 = document.getElementById("password2").value;
            
            var emailpattern = /^[^ ]+@[^ ]+\.[a-z]{2,3}$/;
              if (email.match.value(emailpattern)) {
                alert ("Email is valid!");
                return true;
                }
              else {
                alert ("Not a valid email!");
                return false;
                }
                  
            if (email.length < 5) {
            alert("Not a valid email!");
            return false;
            }
            else {
              alert("Email is valid!");
              return true;
              }
              
              if (password.length < 4) {
              alert("Password is too short");
              return false;
              }
              else {
                alert("Password is valid");
                return true;
                }
              
              if (password2.length< 4) {
                alert ("Password is too short");
                return false;
                }
              else {
                  return true;
                  }
                
              if (password != password2) {
                alert ("Passwords does not much");
                return false;
                }
              else {
                return true;
                }
            }
        </script>
    </body>
    
    </html>

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