JSFiddle - React, Tailwind, and code Playground

HTML

<div id="output"></div>

JavaScript

data='[value]insertdataherethatyouwanttoget[/value]';

function explode(str,begin,end)
{
    t=str.split(begin);
    t=t[1].split(end);
    return t[0];
}

out=explode(data,'[value]','[/value]');
document.getElementById('output').innerHTML+=out+'<br>';

out=explode(data,'insert','wanttoget');
document.getElementById('output').innerHTML+=out;