[Solved] Find a string in the body of the page [closed]

Question

Your question was unclear for me. But the following should work

$( document ).ready(function() {
 document.body.innerHTML = document.body.innerHTML.replace(/target string/g, "replacement string");
});

Accepted Answer

Your question was unclear for me. But the following should work

$( document ).ready(function() {
 document.body.innerHTML = document.body.innerHTML.replace(/target string/g, "replacement string");
});