diff --git a/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php b/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
index a0a896458fc57..3391f15616787 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/MergeExtensionConfigurationPass.php
@@ -117,9 +117,15 @@ public function freezeAfterProcessing(Extension $extension, ContainerBuilder $co
         // serialize config and container to catch env vars nested in object graphs
         $config = serialize($config).serialize($container->getDefinitions()).serialize($container->getAliases()).serialize($container->getParameterBag()->all());
 
+        if (false === stripos($config, 'env_')) {
+            return;
+        }
+
+        preg_match_all('/env_[a-f0-9]{16}_\w+_[a-f0-9]{32}/Ui', $config, $matches);
+        $usedPlaceholders = array_flip($matches[0]);
         foreach (parent::getEnvPlaceholders() as $env => $placeholders) {
             foreach ($placeholders as $placeholder) {
-                if (false !== stripos($config, $placeholder)) {
+                if (isset($usedPlaceholders[$placeholder])) {
                     $this->processedEnvPlaceholders[$env] = $placeholders;
                     break;
                 }
diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index 5f9bb9d1d8de7..033492623b39d 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -1358,15 +1358,17 @@ public function resolveEnvPlaceholders(mixed $value, string|bool $format = null,
             return $result;
         }
 
-        if (!\is_string($value) || 38 > \strlen($value) || !preg_match('/env[_(]/i', $value)) {
+        if (!\is_string($value) || 38 > \strlen($value) || false === stripos($value, 'env_')) {
             return $value;
         }
         $envPlaceholders = $bag instanceof EnvPlaceholderParameterBag ? $bag->getEnvPlaceholders() : $this->envPlaceholders;
 
         $completed = false;
+        preg_match_all('/env_[a-f0-9]{16}_\w+_[a-f0-9]{32}/Ui', $value, $matches);
+        $usedPlaceholders = array_flip($matches[0]);
         foreach ($envPlaceholders as $env => $placeholders) {
             foreach ($placeholders as $placeholder) {
-                if (false !== stripos($value, $placeholder)) {
+                if (isset($usedPlaceholders[$placeholder])) {
                     if (true === $format) {
                         $resolved = $bag->escapeValue($this->getEnv($env));
                     } else {
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
index 50828a47b4bb3..e7bdb78615362 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Compiler/ValidateEnvPlaceholdersPassTest.php
@@ -153,6 +153,19 @@ public function testConcatenatedEnvInConfig()
         $this->assertSame(['scalar_node' => $expected], $container->resolveEnvPlaceholders($ext->getConfig()));
     }
 
+    public function testSurroundedEnvInConfig()
+    {
+        $container = new ContainerBuilder();
+        $container->registerExtension($ext = new EnvExtension());
+        $container->prependExtensionConfig('env_extension', [
+            'scalar_node' => $expected = 'foo%env(BAR)%baz',
+        ]);
+
+        $this->doProcess($container);
+
+        $this->assertSame(['scalar_node' => $expected], $container->resolveEnvPlaceholders($ext->getConfig()));
+    }
+
     public function testEnvIsIncompatibleWithArrayNode()
     {
         $this->expectException(InvalidConfigurationException::class);