discourse/app/assets/javascripts/admin/controllers/admin-watched-words.js.es6

import debounce from 'discourse/lib/debounce';

export default Ember.Controller.extend({
  filter: null,
  filtered: false,
  showWords: false,
  disableShowWords: Ember.computed.alias('filtered'),
  regularExpressions: null,

  filterContentNow() {

    if (!!Ember.isEmpty(this.get('allWatchedWords'))) return;

    let filter;
    if (this.get('filter')) {
      filter = this.get('filter').toLowerCase();
    }

    if (filter === undefined || filter.length < 1) {
      this.set('model', this.get('allWatchedWords'));
      return;
    }

    const matchesByAction = [];

    this.get('allWatchedWords').forEach(wordsForAction => {
      const wordRecords = wordsForAction.words.filter(wordRecord => {
        return (wordRecord.word.indexOf(filter) > -1);
      });
      matchesByAction.pushObject( Ember.Object.create({
        nameKey: wordsForAction.nameKey,
        name: wordsForAction.name,
        words: wordRecords,
        count: wordRecords.length
      }) );
    });

    this.set('model', matchesByAction);
  },

  filterContent: debounce(function() {
    this.filterContentNow();
    this.set('filtered', !Ember.isEmpty(this.get('filter')));
  }, 250).observes('filter'),

  actions: {
    clearFilter() {
      this.setProperties({ filter: '' });
    }
  }

});