JSFiddle - React, Tailwind, and code Playground
by fkhairzad
HTML
<div id="test"></div>
JavaScript
var demoText = "Internal only [Internal Only]."
var test = demoText.replace(/\[Internal\sOnly\]/, '<span style="color:red; font-weight:bold;">[Internal Only]</span>');
document.getElementById('test').innerHTML=test;