How to Replace all the text occurrences in the DOM with jQuery

$(function () {

  $.fn.getTextNodes = function(contentText) {

    return $(this).find(":not(iframe)").addBack().contents().filter(function() {

      return this.nodeType == 3 && this.nodeValue.indexOf(contentText) != -1;

    });

  };

  var config = {}

  config.text_config = [

    {

      src: "Lorem ipsum",

      target: "live long and prosper"

    }

  ];

  config.text_config.forEach(function (obj) {

    var re = new RegExp(obj.src, 'g');

    $('*').getTextNodes(obj.src).each(function(item, element) {

      this.nodeValue = this.nodeValue.replace(re, 'REPLACEMENT_TEXT');

    });

  });

});

html

<script src="//code.jquery.com/jquery-1.11.3.js"></script>

<div id="Message area">

    <div class="selected-div">

        Operation Lorem ipsum Lorem ipsum 1

    </div>

    <div class="selected-div">

        Operation Lorem ipsum Lorem ipsum 2

    </div>

    <div class="selected-div">

        Operation Lorem ipsum Lorem ipsum 3

    </div>

    <div class="selected-div">

        Operation Lorem ipsum Lorem ipsum4

    </div>

</div>