JSFiddle - React, Tailwind, and code Playground

HTML

<p id='num'>Превед медвед сочи 2014</p>

JavaScript

var myNode = document.getElementById(num); 
var myStr = myNode.textContent;
myStr = myStr.substr(0, 5) + '*******' + myStr.substr(11);
myNode.textContent = myStr;