"email validation with AjaxContoller through"
Bootstrap 4.1.1 Snippet by Hituat

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
@RemoteMethod
public Boolean validateemailid(String email){
return isValidEmailAddress(email);
}
public static boolean isValidEmailAddress(String str) {
String at = "@";
String dot = ".";
int lat = str.indexOf(at);
int lstr = str.length();
if (str.indexOf(at) == -1) {
return false;
}
if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {
return false;
}
if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {
return false;
}
if (str.indexOf(at, (lat + 1)) != -1) {
return false;
}
if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {
return false;
}
if (str.indexOf(dot, (lat + 2)) == -1) {
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

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