refactor(RegExp): use /.../ to create RegExp literal

fixes #2691

modules/angular2/src/render/api.ts

@@ -130,11 +130,6 @@ export class ProtoViewDto {
   }
 }
 
-// group 1: property from "[property]"
-// group 2: event from "(event)"
-// group 3: action from "@action"
-var hostRegExp = RegExpWrapper.create('^(?:(?:\\[([^\\]]+)\\])|(?:\\(([^\\)]+)\\))|(?:@(.+)))$');
-
 export class DirectiveMetadata {
   static get DIRECTIVE_TYPE() { return 0; }
   static get COMPONENT_TYPE() { return 1; }
@@ -156,6 +151,10 @@ export class DirectiveMetadata {
   hostProperties: Map<string, string>;
   hostAttributes: Map<string, string>;
   hostActions: Map<string, string>;
+  // group 1: "property" from "[property]"
+  // group 2: "event" from "(event)"
+  // group 3: "action" from "@action"
+  private static _hostRegExp = /^(?:(?:\[([^\]]+)\])|(?:\(([^\)]+)\))|(?:@(.+)))$/g;
 
   constructor({id, selector, compileChildren, events, hostListeners, hostProperties, hostAttributes,
                hostActions, properties, readAttributes, type, callOnDestroy, callOnChange,
@@ -225,7 +224,7 @@ export class DirectiveMetadata {
 
     if (isPresent(host)) {
       MapWrapper.forEach(host, (value: string, key: string) => {
-        var matches = RegExpWrapper.firstMatch(hostRegExp, key);
+        var matches = RegExpWrapper.firstMatch(DirectiveMetadata._hostRegExp, key);
         if (isBlank(matches)) {
           hostAttributes.set(key, value);
         } else if (isPresent(matches[1])) {