only in patch2:
unchanged:
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -10,6 +10,7 @@
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Component\Utility\Unicode;
 use Drupal\Core\Config\BootstrapConfigStorageFactory;
+use Drupal\Core\Database\Database;
 use Drupal\Core\Installer\InstallerKernel;
 use Drupal\Core\Logger\RfcLogLevel;
 use Drupal\Core\Test\TestDatabase;
@@ -141,9 +142,14 @@
 /**
  * Regular expression to match PHP function names.
  *
+ * @deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use
+ *   Database::DRIVER_NAME_PATTERN instead.
+ *
+ * @see https://www.drupal.org/node/2936107
+ *
  * @see http://php.net/manual/language.functions.php
  */
-const DRUPAL_PHP_FUNCTION_PATTERN = '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*';
+const DRUPAL_PHP_FUNCTION_PATTERN = Database::DRIVER_NAME_PATTERN;
 
 /**
  * $config_directories key for active directory.
only in patch2:
unchanged:
--- a/core/modules/update/update.module
+++ b/core/modules/update/update.module
@@ -693,7 +693,7 @@ function update_verify_update_archive($project, $archive_file, $directory) {
   $incompatible = [];
   /** @var \Drupal\Core\File\FileSystemInterface $file_system */
   $file_system = \Drupal::service('file_system');
-  $files = $file_system->scanDirectory("$directory/$project", '/^' . DRUPAL_PHP_FUNCTION_PATTERN . '\.info.yml$/', ['key' => 'name', 'min_depth' => 0]);
+  $files = $file_system->scanDirectory("$directory/$project", '/.*\.info.yml$/', ['key' => 'name', 'min_depth' => 0]);
   foreach ($files as $file) {
     // Get the .info.yml file for the module or theme this file belongs to.
     $info = \Drupal::service('info_parser')->parse($file->uri);