Check If Document Contains Any String From Array And Replace It

Trying to check the document for any string in a given array and replace it with something matched string. I tried just looping through the array and replacing

Solution 1:

This is what I would do

function escapeRegExp(str) {
  return str.replace(/[-[\/{}*+?.\\\]^$]/g, "\\$&");
}

var code = document.body.innerHTML;
array.forEach(function(v) {
  code = code.replace(new RegExp(escapeRegExp(v)), "g"), "<em>"+v+"</em>")
}
document.body.innerHTML = code;

I am avoiding multiple assignments to innerHTML to avoid unnecessary reflows (performance)