Sampel Regex

HTML

<input id="inp" type="text" placeholder="Masukkan email..."> <button onclick="check();">Validasi!</button>

CSS

body {padding:50px;}

JavaScript

function check() {
    var pattern = document.getElementById('inp').value;
    if (pattern.match(/^([^0-9\.\+])([\w.\+])+\@(([\w\-])+\.)+[a-zA-Z0-9]{2,}/)) {
        alert("Email Anda Valid!");
    } else {
        alert("Tidak valid!");
    }
}