[ADF-1039] Search results highlighting (#2080)

* Provide a way to highlight the searched word

* Add unit test

ng2-components/ng2-alfresco-core/src/pipes/text-highlight.pipe.ts

@@ -0,0 +1,40 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({
+    name: 'highlight'
+})
+export class HighlightPipe implements PipeTransform {
+
+    constructor() { }
+
+    transform(text: string, search: string): any {
+        if (search && text) {
+            let pattern = search.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&');
+            pattern = pattern.split(' ').filter((t) => {
+                return t.length > 0;
+            }).join('|');
+            const regex = new RegExp(pattern, 'gi');
+            let result = text.replace(regex, (match) => `<span class="highlight">${match}</span>`);
+            return result;
+        } else {
+            return text;
+        }
+    }
+}