JSFiddle - React, Tailwind, and code Playground

JavaScript

var html = '\
    <html>\
    <body>\
\
    <a href="/foobar.txt">Hello</a>\
    <a href="foobar.txt">World</a>\
\
    </body>\
    </html>';
    
var reg = /\<body[^>]*\>([^]*)\<\/body/m;
var content = html.match( reg )[1];

document.body.innerHTML = content;