Submit form with Enter key without submit button form post/get

HTML

<form>
    <input type="text" name="name">
</form

JS

$("input").keypress(function(event) {
    if (event.which == 13) {
        event.preventDefault();
        $("form").submit();
    }
});

JQuery regex validation of e-mail check preg_match

var userinput = $(this).val();
var pattern = /^\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b$/i

if (!pattern.test(userinput)) {
    alert('not a valid e-mail address');
}​

how to check string and number in jquery

var EmailCheck = new RegExp(/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/);

var UsernameVal = document.getElementById('mobileNo').value;

if (!isNaN(parseFloat(UsernameVal)) && isFinite(UsernameVal)) {
    if (UsernameVal.length < 10 || UsernameVal.length > 10 || UsernameVal.length > 11) {
        document.getElementById("errorMsg").innerHTML = "Please Enter 10 Digit Mobile No. ";
        return false;
    }
} else if (!EmailCheck.test(UsernameVal)) {
    document.getElementById("errorMsg").innerHTML = "Please Enter Correct Email";
    return false;
}