JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
<script src="http://ckeditor.com/apps/ckeditor/4.3.1/ckeditor.js"></script>
<body>
  <table>
      <tr><td width="200px">IMG-Tag- Test:</td><td id="img"></td></tr>
      <tr><td>"FullRule-Test:</td><td id="imgfull"></td></tr>
    </table>
</body>

CSS

#template {
    display: none;
}

JavaScript

"use strict";
$(document).ready(function(){
    var fullRule = 'img[!src,class](!a,b,c)';
    var f = new CKEDITOR.filter(fullRule);
    
    // just the image tag = works
    $('#img').html(
        toStr(f.check("img"))
    );
    // now the rule we actually used to create the rule    
    $('#imgfull').html(
        toStr(f.check(fullRule))
    );    
    
});

// helper
function toStr(bool) {
    if(bool) {
        return "true";
    }
    else {
        return "false"
    }    
}