javascript mail validation (check)

var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

if (!filter.test(txtEmail.value)) {

alert('Please provide a valid email address');

txtEmail.focus();

return false;

}

use this javascript function to validate email addresses.