<link-supressor>

application.template.hbs

<link-supressor pattern="(facebook|twitter)" message="Get back to work!">
  <ul>
    <li>Not censored: <a href="http://emberjs.com">http://emberjs.com</a></li>
    <li>Censored: <a href="http://facebook.com">http://facebook.com</a></li>
    <li>Censored: <a href="http://twitter.com">http://twitter.com</a></li>
    <li>Not censored: <a href="http://wikipedia.org">http://wikipedia.org</a></li>
  </ul>
</link-supressor>

link-supressor.component.js

import Ember from 'ember';

export default Ember.GlimmerComponent.extend({
  click(event) {
    var pattern = new RegExp(this.attrs.pattern || ".*");
    var href = (event.target.tagName === "A") && (event.target.href);

    if (href && pattern.test(href)) {
      alert(this.attrs.message || "Link blocked!");
      event.preventDefault();
    }
  }
});

twiddle.json

{
  "version": "0.4.10",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "hax": "https://cdn.rawgit.com/chancancode/5b7b95b6268d51cdcaae/raw/92e0654083305c73cd601381a6cea705be9f8890/hax.js",
    "ember": "http://builds.emberjs.com/canary/ember.debug.js",
    "ember-template-compiler": "http://builds.emberjs.com/canary/ember-template-compiler.js"
  }
}