Merge branch '2.8' into 3.4

* 2.8:
  use brace-style regex delimiters
  Fixed typo RecursiveIterator -> RecursiveIteratorIterator
  [Validator] make phpdoc of ObjectInitializerInterface interface more accurate

src/Symfony/Component/Form/Util/InheritDataAwareIterator.php

@@ -17,7 +17,7 @@ namespace Symfony\Component\Form\Util;
  * Contrary to \ArrayIterator, this iterator recognizes changes in the original
  * array during iteration.
  *
- * You can wrap the iterator into a {@link \RecursiveIterator} in order to
+ * You can wrap the iterator into a {@link \RecursiveIteratorIterator} in order to
  * enter any child form that inherits its parent's data and iterate the children
  * of that form as well.
  *

src/Symfony/Component/HttpFoundation/Request.php

@@ -641,7 +641,7 @@ class Request
     public static function setTrustedHosts(array $hostPatterns)
     {
         self::$trustedHostPatterns = array_map(function ($hostPattern) {
-            return sprintf('#%s#i', $hostPattern);
+            return sprintf('{%s}i', $hostPattern);
         }, $hostPatterns);
         // we need to reset trusted hosts on trusted host patterns change
         self::$trustedHosts = array();

src/Symfony/Component/HttpFoundation/Tests/RequestTest.php

@@ -23,6 +23,7 @@ class RequestTest extends TestCase
     {
         // reset
         Request::setTrustedProxies(array(), -1);
+        Request::setTrustedHosts(array());
     }
 
     public function testInitialize()
@@ -2007,9 +2008,15 @@ class RequestTest extends TestCase
 
         $request->headers->set('host', 'subdomain.trusted.com');
         $this->assertEquals('subdomain.trusted.com', $request->getHost());
+    }
 
-        // reset request for following tests
-        Request::setTrustedHosts(array());
+    public function testSetTrustedHostsDoesNotBreakOnSpecialCharacters()
+    {
+        Request::setTrustedHosts(array('localhost(\.local){0,1}#,example.com', 'localhost'));
+
+        $request = Request::create('/');
+        $request->headers->set('host', 'localhost');
+        $this->assertSame('localhost', $request->getHost());
     }
 
     public function testFactory()