Перевірка E-mail
<script>
function isEmail(email) {
var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
alert(regex.test(email));
}
</script>
<button onclick="isEmail('net@net.net')">Send</button>
<script>
function isEmail(email) {
var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
alert(regex.test(email));
}
</script>
<button onclick="isEmail('net@net.net')">Send</button>