diff --git a/core/includes/schema.inc b/core/includes/schema.inc
index 7b7aec9..03cb51c 100644
--- a/core/includes/schema.inc
+++ b/core/includes/schema.inc
@@ -126,7 +126,7 @@ function drupal_get_schema_versions($module) {
     }
 
     // Prepare regular expression to match all possible defined hook_update_N().
-    $regexp = '/^(?P<module>.+)_update_(?P<version>\d+)$/';
+    $regexp = '/^(?<module>.+)_update_(?<version>\d+)$/';
     $functions = get_defined_functions();
     // Narrow this down to functions ending with an integer, since all
     // hook_update_N() functions end this way, and there are other
diff --git a/core/lib/Drupal/Core/Extension/ModuleHandler.php b/core/lib/Drupal/Core/Extension/ModuleHandler.php
index 3a5ffbe..d559690 100644
--- a/core/lib/Drupal/Core/Extension/ModuleHandler.php
+++ b/core/lib/Drupal/Core/Extension/ModuleHandler.php
@@ -489,12 +489,12 @@ protected function getImplementationInfo($hook) {
   protected function parseDependency($dependency) {
     // We use named subpatterns and support every op that version_compare
     // supports. Also, op is optional and defaults to equals.
-    $p_op = '(?P<operation>!=|==|=|<|<=|>|>=|<>)?';
+    $p_op = '(?<operation>!=|==|=|<|<=|>|>=|<>)?';
     // Core version is always optional: 8.x-2.x and 2.x is treated the same.
     $p_core = '(?:' . preg_quote(DRUPAL_CORE_COMPATIBILITY) . '-)?';
-    $p_major = '(?P<major>\d+)';
+    $p_major = '(?<major>\d+)';
     // By setting the minor version to x, branches can be matched.
-    $p_minor = '(?P<minor>(?:\d+|x)(?:-[A-Za-z]+\d+)?)';
+    $p_minor = '(?<minor>(?:\d+|x)(?:-[A-Za-z]+\d+)?)';
     $value = array();
     $parts = explode('(', $dependency, 2);
     $value['name'] = trim($parts[0]);
diff --git a/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
index a75ade4..146e007 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php
@@ -1608,7 +1608,7 @@ protected function checkForMetaRefresh() {
       if (!empty($refresh)) {
         // Parse the content attribute of the meta tag for the format:
         // "[delay]: URL=[page_to_redirect_to]".
-        if (preg_match('/\d+;\s*URL=(?P<url>.*)/i', $refresh[0]['content'], $match)) {
+        if (preg_match('/\d+;\s*URL=(?<url>.*)/i', $refresh[0]['content'], $match)) {
           return $this->drupalGet($this->getAbsoluteUrl(decode_entities($match['url'])));
         }
       }