diff --git a/symfony/framework-bundle/3.3/manifest.json b/symfony/framework-bundle/3.3/manifest.json
index bffbcfe7..ad7fd41a 100644
--- a/symfony/framework-bundle/3.3/manifest.json
+++ b/symfony/framework-bundle/3.3/manifest.json
@@ -15,7 +15,7 @@
         "APP_ENV": "dev",
         "APP_SECRET": "%generate(secret)%",
         "#TRUSTED_PROXIES": "127.0.0.1,127.0.0.2",
-        "#TRUSTED_HOSTS": "localhost,example.com"
+        "#TRUSTED_HOSTS": "'^localhost|example\\.com$'"
     },
     "gitignore": [
         "/.env.local",
diff --git a/symfony/framework-bundle/3.3/public/index.php b/symfony/framework-bundle/3.3/public/index.php
index 3f40a88b..9b4b36b4 100644
--- a/symfony/framework-bundle/3.3/public/index.php
+++ b/symfony/framework-bundle/3.3/public/index.php
@@ -17,7 +17,7 @@ if ($trustedProxies = $_SERVER['TRUSTED_PROXIES'] ?? $_ENV['TRUSTED_PROXIES'] ??
 }
 
 if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? $_ENV['TRUSTED_HOSTS'] ?? false) {
-    Request::setTrustedHosts(explode(',', $trustedHosts));
+    Request::setTrustedHosts([$trustedHosts]);
 }
 
 $kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);
diff --git a/symfony/framework-bundle/4.2/manifest.json b/symfony/framework-bundle/4.2/manifest.json
index bffbcfe7..ad7fd41a 100644
--- a/symfony/framework-bundle/4.2/manifest.json
+++ b/symfony/framework-bundle/4.2/manifest.json
@@ -15,7 +15,7 @@
         "APP_ENV": "dev",
         "APP_SECRET": "%generate(secret)%",
         "#TRUSTED_PROXIES": "127.0.0.1,127.0.0.2",
-        "#TRUSTED_HOSTS": "localhost,example.com"
+        "#TRUSTED_HOSTS": "'^localhost|example\\.com$'"
     },
     "gitignore": [
         "/.env.local",
diff --git a/symfony/framework-bundle/4.2/public/index.php b/symfony/framework-bundle/4.2/public/index.php
index 3f40a88b..9b4b36b4 100644
--- a/symfony/framework-bundle/4.2/public/index.php
+++ b/symfony/framework-bundle/4.2/public/index.php
@@ -17,7 +17,7 @@ if ($trustedProxies = $_SERVER['TRUSTED_PROXIES'] ?? $_ENV['TRUSTED_PROXIES'] ??
 }
 
 if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? $_ENV['TRUSTED_HOSTS'] ?? false) {
-    Request::setTrustedHosts(explode(',', $trustedHosts));
+    Request::setTrustedHosts([$trustedHosts]);
 }
 
 $kernel = new Kernel($_SERVER['APP_ENV'], $_SERVER['APP_DEBUG']);