1function validateEmail(email) {
2 const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
3 return re.test(String(email).toLowerCase());
4}
1function checkEmail() {
2
3 var email = document.getElementById('txtEmail');
4 var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
5
6 if (!filter.test(email.value)) {
7 alert('Please provide a valid email address');
8 email.focus;
9 return false;
10 }
11}
12
13- Call the function on Email textbox