let reg = /^(\d{4})\d+(\d{4})$/;
let str = no.replace(reg,"**** **** **** $2");
let str2 = no.replace(reg,"$1 **** **** $2");
let reg = /^(\d{4})\d+(\d{4})$/;
let str = no.replace(reg,"**** **** **** $2");
let str2 = no.replace(reg,"$1 **** **** $2");