Handle invalid regexes when filtering code search results

app/components/addon-source-usages.js

@@ -48,7 +48,12 @@ function filterByFilePath(usages, filterTerm) {
   if (isEmpty(filterTerm)) {
     return usages;
   }
-  let filterRegex = new RegExp(filterTerm);
+  let filterRegex;
+  try {
+    filterRegex = new RegExp(filterTerm);
+  } catch(e) {
+    return [];
+  }
   return usages.filter((usage) => {
     return usage.filename.match(filterRegex);
   });

app/components/code-search.js

@@ -175,7 +175,12 @@ function filterByFilePath(results, filterTerm) {
   }
 
   let filteredList = [];
-  let filterRegex = new RegExp(filterTerm);
+  let filterRegex;
+  try {
+    filterRegex = new RegExp(filterTerm);
+  } catch(e) {
+    return [];
+  }
   results.forEach((result) => {
     let filteredFiles = result.files.filter((filePath) => {
       return filePath.match(filterRegex);

tests/acceptance/code-search-test.js

@@ -529,6 +529,54 @@ test('filtering works with sorting and pagination', function(assert) {
   });
 });
 
+test('when file filter regex is invalid', function(assert) {
+  server.create('addon', { name: 'ember-try' });
+  server.create('addon', { name: 'ember-blanket' });
+  server.create('addon', { name: 'ember-foo' });
+
+  let invalidFilter = '(index';
+
+  server.get('/search/addons', () => {
+    return {
+      results: [
+        {
+          addon: 'ember-try',
+          count: 1,
+          files: ['app/controllers/index.js']
+        },
+        {
+          addon: 'ember-blanket',
+          count: 2,
+          files: ['app/components/blanket.js', 'app/templates/components/blanket.hbs']
+        },
+        {
+          addon: 'ember-foo',
+          count: 3,
+          files: ['app/controllers/index.js', 'app/controllers/index.js', 'app/services/current-foo.js']
+        }
+      ]
+    };
+  });
+
+  visit('/code-search');
+  fillIn('#code-search-input', 'whatever');
+  click('.test-submit-search');
+
+  andThen(function() {
+    assert.equal(find('.test-addon-name').length, 3, 'shows all addons before filtering');
+  });
+
+  fillIn('.test-file-filter-input', invalidFilter);
+
+  andThen(function() {
+    assert.equal(find('.test-addon-name').length, 0, 'no addons show after filtering');
+    assert.contains('.test-result-info', '3 addons', 'full result count still shows');
+    assert.contains('.test-result-info', '6 usages', 'full usage count still shows');
+    assert.contains('.test-filtered-result-info', '0 addons', 'filtered result count is 0');
+    assert.contains('.test-filtered-result-info', '0 usages', 'filtered usage count is 0');
+  });
+});
+
 function searchResults(addons) {
   return addons.map((addon) => {
     return {