function validateEmail(email) {
var emailReg = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,6})?$/;
return emailReg.test(email);
}
Usage:-
if(validateEmail(emailString)){
alert('Your email is valid');
}
else{
alert('Your email is not valid! There should be atleast @ and one dot(.) present in it');
}