Creating Base module and extracting placeholder rendering

src/js/parser/javascript/regexp.js

@@ -1,4 +1,7 @@
-export default {
+import _ from 'lodash';
+import Base from './base.js';
+
+export default _.extend({}, Base, {
   matches() {
     if (this.elements[1].regexp) {
       return [this.match].concat(this.elements[1].regexp.matches());
@@ -6,4 +9,4 @@ export default {
       return [this.match];
     }
   }
-};
+});