diff --git a/core/lib/Drupal/Core/Test/TestDiscovery.php b/core/lib/Drupal/Core/Test/TestDiscovery.php
index 16c551ed06e399813885146334c81eea48c58cf9..108d17730c10252b54e2ad6f8c0422fe3e5bbe3c 100644
--- a/core/lib/Drupal/Core/Test/TestDiscovery.php
+++ b/core/lib/Drupal/Core/Test/TestDiscovery.php
@@ -174,7 +174,7 @@ public function getTestClasses($extension = NULL, array $types = []) {
       }
       catch (MissingGroupException $e) {
         // If the class name ends in Test and is not a migrate table dump.
-        if (preg_match('/Test$/', $classname) && !str_contains($classname, 'migrate_drupal\Tests\Table')) {
+        if (str_ends_with($classname, 'Test') && !str_contains($classname, 'migrate_drupal\Tests\Table')) {
           throw $e;
         }
         // If the class is @group annotation just skip it. Most likely it is an
diff --git a/core/modules/node/src/Plugin/migrate/source/d6/Node.php b/core/modules/node/src/Plugin/migrate/source/d6/Node.php
index d6b5596a63456f03002cc12e06fabc488e22da8c..b6a13524190172213c4f6b851abde9a075288c93 100644
--- a/core/modules/node/src/Plugin/migrate/source/d6/Node.php
+++ b/core/modules/node/src/Plugin/migrate/source/d6/Node.php
@@ -249,7 +249,7 @@ protected function getFieldInfo($node_type) {
       foreach ($this->fieldInfo as $type => $fields) {
         foreach ($fields as $field => $info) {
           foreach ($info as $property => $value) {
-            if ($property == 'db_columns' || preg_match('/_settings$/', $property)) {
+            if ($property == 'db_columns' || str_ends_with($property, '_settings')) {
               $this->fieldInfo[$type][$field][$property] = unserialize($value);
             }
           }
diff --git a/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php b/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
index 2ff57aebeef2293ac2a6d7187bd75469cdfa4a81..e55a6ffa402b12e88889be947919f19fa2ff1ed6 100644
--- a/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
+++ b/core/modules/pgsql/src/Driver/Database/pgsql/Schema.php
@@ -883,13 +883,13 @@ protected function introspectIndexSchema($table) {
       ':table_name' => $full_name,
     ])->fetchAll();
     foreach ($result as $row) {
-      if (preg_match('/_pkey$/', $row->index_name)) {
+      if (str_ends_with($row->index_name, '_pkey')) {
         $index_schema['primary key'][] = $row->column_name;
       }
-      elseif (preg_match('/_key$/', $row->index_name)) {
+      elseif (str_ends_with($row->index_name, '_key')) {
         $index_schema['unique keys'][$row->index_name][] = $row->column_name;
       }
-      elseif (preg_match('/_idx$/', $row->index_name)) {
+      elseif (str_ends_with($row->index_name, '_idx')) {
         $index_schema['indexes'][$row->index_name][] = $row->column_name;
       }
     }
diff --git a/core/modules/update/tests/src/Functional/UpdateContribTest.php b/core/modules/update/tests/src/Functional/UpdateContribTest.php
index a45c102cb926003edc3ad21a3f02714abbca6cdb..dfde2d412135ea85522366b41d894d6c43b41de4 100644
--- a/core/modules/update/tests/src/Functional/UpdateContribTest.php
+++ b/core/modules/update/tests/src/Functional/UpdateContribTest.php
@@ -347,7 +347,7 @@ public function testUpdateShowDisabledThemes() {
     // Make sure all the update_test_* themes are disabled.
     $extension_config = $this->config('core.extension');
     foreach ($extension_config->get('theme') as $theme => $weight) {
-      if (preg_match('/^update_test_/', $theme)) {
+      if (str_starts_with($theme, 'update_test_')) {
         $extension_config->clear("theme.$theme");
       }
     }
diff --git a/core/modules/views/tests/src/Functional/Plugin/PagerTest.php b/core/modules/views/tests/src/Functional/Plugin/PagerTest.php
index 253eae61500d6184fe253aa64c9fb2794f0ab536..b873aca21e401d91724060bd636cbea66830a3c8 100644
--- a/core/modules/views/tests/src/Functional/Plugin/PagerTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/PagerTest.php
@@ -428,7 +428,7 @@ public function testRenderNullPager() {
     $view->pager = NULL;
     $output = $view->render();
     $output = (string) \Drupal::service('renderer')->renderRoot($output);
-    $this->assertEquals(0, preg_match('/<ul class="pager">/', $output), 'The pager is not rendered.');
+    $this->assertStringNotContainsString('<ul class="pager">', $output);
   }
 
   /**
diff --git a/core/tests/Drupal/Tests/ComposerIntegrationTest.php b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
index f37883e9ac4ce34e891dd48327f650cb3ba37518..017aec0815eb1c9c8d569797d117351af11555f8 100644
--- a/core/tests/Drupal/Tests/ComposerIntegrationTest.php
+++ b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
@@ -53,7 +53,7 @@ public function testComposerLockHash() {
    * @dataProvider providerTestComposerJson
    */
   public function testComposerTilde($path) {
-    if (preg_match('#composer/Metapackage/CoreRecommended/composer.json$#', $path)) {
+    if (str_ends_with($path, 'composer/Metapackage/CoreRecommended/composer.json')) {
       $this->markTestSkipped("$path has tilde");
     }
     $content = json_decode(file_get_contents($path), TRUE);