JSFiddle - React, Tailwind, and code Playground

HTML

Results:
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JavaScript

var testFunctions = [];

testFunctions.push(function replaceViaSplitJoin(inSource, inToReplace, inReplaceWith) {
  return inSource.split(inToReplace).join(inReplaceWith);
});

testFunctions.push(function replaceAllViaRegex(input, stringToReplace, stringToReplaceWith){
	//http://stackoverflow.com/a/2116614/5665980
	return input.replace(new RegExp(stringToReplace,"g"),stringToReplaceWith)
});

testFunctions.push(function replaceSubstring(inSource, inToReplace, inReplaceWith) {
	//http://stackoverflow.com/a/11019805/5665980
  var outString = inSource;
  while (true) {
    var idx = outString.indexOf(inToReplace);
    if (idx == -1) {
      break;
    }
    outString = outString.substring(0, idx) + inReplaceWith +
      outString.substring(idx + inToReplace.length);
  }
  return outString;
});

String.prototype.replaceAllBySubstrings = function(_f, _r, _c){ 
	//http://stackoverflow.com/a/23209168/5665980
  var o = this.toString();
  var r = '';
  var s = o;
  var b = 0;
  var e = -1;
  if(_c){ _f = _f.toLowerCase(); s = o.toLowerCase(); }

  while((e=s.indexOf(_f)) > -1)
  {
    r += o.substring(b, b+e) + _r;
    s = s.substring(e+_f.length, s.length);
    b += e+_f.length;
  }

  // Add Leftover
  if(s.length>0){ r+=o.substring(o.length-s.length, o.length); }

  // Return New String
  return r;
};

testFunctions.push(function replaceAllBySubstrings(inSource, inToReplace, inReplaceWith){
	return inSource.replaceAllBySubstrings(inToReplace,inReplaceWith);
})

String.prototype.replaceAllSaferRegex = function(str1, str2, ignore) 
{
		//http://stackoverflow.com/a/6714233/5665980
    return this.replace(new RegExp(str1.replace(/([\/\,\!\\\^\$\{\}\[\]\(\)\.\*\+\?\|\<\>\-\&])/g,"\\$&"),(ignore?"gi":"g")),(typeof(str2)=="string")?str2.replace(/\$/g,"$$$$"):str2);
} 

testFunctions.push(function replaceAllSaferRegex(inSource, inToReplace, inReplaceWith){
	return inSource.replaceAllSaferRegex(inToReplace,inReplaceWith);
})

testFunctions.push(function...