JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <title>Testing</title>
    </head>
    <body>
        <h1><u>Demo jQuery Replace</u></h1>
        Hello, this is a test replacing -9o0-9909 with <b>The new string</b>.
        <br/><br/>
        If I wrote -1o9-2202 and -1o9-2202 again but really wanted it to be <b>The ALL new string</b>.
        <br/><br/>
        pr_022: \n\r 6: \n\r در حین کار تلفن همراه را جواب میدهند: \n\r 2018-11-24 09:57:48: \n\r \n\r
    </body>
</html> 

<h1 class="QcTitle">@item.QcTitle</h1>

JavaScript

var replaced = $("body").html().replace('-9o0-9909','<b>The new string</b>');
$("body").html(replaced);

var replaced = $("body").html().replace(/-1o9-2202/g,'<b>The ALL new string</b>');
$("body").html(replaced);

$("body").html($("body").html().replace(/\\n\\r/g,'<br/>'));

$(".QcTitle").html();