masking account number
<script type="text/javascript"> $('#acnumber').text(function(_, str) { return str = str.replace(/\d(?=\d{4})/g, "X"); }); </script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div id="ccnumber">1234567891234567</div>