function hideemail(target) { var email = target //anas.behhari@gmail.com var hiddenEmail = ""; for (i = 0; i < email.length; i++) { if (i > 2 && i< email.indexOf("@") ) { hiddenEmail += "*"; } else { hiddenEmail += email[i]; } } console.log(hiddenEmail) //an.*******@gmail.com }