JSFiddle - React, Tailwind, and code Playground
by Blake Plumb
JavaScript
var htmlData = 'test here<br /><table border="1" cellpadding="1" cellspacing="1" style="width: 500px;"><tbody><tr><td>111</td><td>222</td></tr><tr><td>333</td><td>444</td></tr><tr><td>555</td><td>666</td></tr></tbody></table><br />second test';
var el = $(htmlData);
if(el.find("table").length>0){
console.log("it contains table");
}