An iframe instead of a div

How would you change this function to work with an iframe instead of a div? I have an iframe that looks like this:

<iframe id="wmd-input_ifr" frameborder="0" allowtransparency="true"></iframe>

var regExUrl = /https?:\/\/([\w\d-\.]+)?[\w\d-\.]+\.{1}[\w]{1,4}((\/{1})?)([a-zA-Z0-9&-@_\+.‌~#?\/=]*)?/gi;

var div = document.getElementById('div');

div.onkeyup = function(){
  if(div.innerHTML.match(regExUrl)){
   $("div").addClass("link");
  } else {
       $("div").removeClass("link");...

Code (markup):

An iframe instead of a div

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