diff --git a/tests/Config/PluginListTest.php b/tests/Config/PluginListTest.php
index 1274eff9d..52fce5d3b 100644
--- a/tests/Config/PluginListTest.php
+++ b/tests/Config/PluginListTest.php
@@ -159,7 +159,7 @@ class PluginListTest extends TestCase
     {
         $plugin_list = new PluginList($this->config_file->reveal(), $this->composer_lock->reveal());
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessageRegExp('/unknown plugin/i');
+        $this->expectExceptionMessageMatches('/unknown plugin/i');
         $plugin_list->resolvePluginClass('vendor/package');
     }
 
diff --git a/tests/Config/PluginTest.php b/tests/Config/PluginTest.php
index 6fd8b4976..88099c63f 100644
--- a/tests/Config/PluginTest.php
+++ b/tests/Config/PluginTest.php
@@ -1156,7 +1156,7 @@ class PluginTest extends TestCase
         $this->project_analyzer->trackTaintedInputs();
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/TaintedHtml/');
+        $this->expectExceptionMessageMatches('/TaintedHtml/');
 
         $this->analyzeFile($file_path, new Context());
     }
diff --git a/tests/DocumentationTest.php b/tests/DocumentationTest.php
index 0c8ab29d2..99f04cacf 100644
--- a/tests/DocumentationTest.php
+++ b/tests/DocumentationTest.php
@@ -237,7 +237,7 @@ class DocumentationTest extends TestCase
         }
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $codebase = $this->project_analyzer->getCodebase();
         $codebase->config->visitPreloadedStubFiles($codebase);
diff --git a/tests/FileUpdates/ErrorAfterUpdateTest.php b/tests/FileUpdates/ErrorAfterUpdateTest.php
index 1f2bade42..c9805f589 100644
--- a/tests/FileUpdates/ErrorAfterUpdateTest.php
+++ b/tests/FileUpdates/ErrorAfterUpdateTest.php
@@ -90,7 +90,7 @@ class ErrorAfterUpdateTest extends TestCase
         }
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $codebase->reloadFiles($this->project_analyzer, array_keys($end_files));
 
diff --git a/tests/IncludeTest.php b/tests/IncludeTest.php
index 0f06ff7e6..bfbc4b557 100644
--- a/tests/IncludeTest.php
+++ b/tests/IncludeTest.php
@@ -88,7 +88,7 @@ class IncludeTest extends TestCase
         $config->skip_checks_on_unresolvable_includes = false;
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $codebase->scanFiles();
 
diff --git a/tests/PsalmPluginTest.php b/tests/PsalmPluginTest.php
index 4a33e6034..592c2d97e 100644
--- a/tests/PsalmPluginTest.php
+++ b/tests/PsalmPluginTest.php
@@ -150,7 +150,7 @@ class PsalmPluginTest extends TestCase
         $help_command = new CommandTester($this->app->find('help'));
         $help_command->execute(['command_name' => $command]);
         $output = $help_command->getDisplay();
-        $this->assertRegExp('/Usage:.*$\s+' . preg_quote($command, '/') . '\b/m', $output);
+        $this->assertMatchesRegularExpression('/Usage:.*$\s+' . preg_quote($command, '/') . '\b/m', $output);
     }
 
     /**
diff --git a/tests/TaintTest.php b/tests/TaintTest.php
index cfae07433..75419f8a6 100644
--- a/tests/TaintTest.php
+++ b/tests/TaintTest.php
@@ -50,7 +50,7 @@ class TaintTest extends TestCase
         }
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $file_path = self::$src_dir_path . 'somefile.php';
 
diff --git a/tests/TestCase.php b/tests/TestCase.php
index f48b50cc9..69502082e 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -24,7 +24,6 @@ use function defined;
 use function getcwd;
 use function ini_set;
 use function is_string;
-use function method_exists;
 
 use const ARRAY_FILTER_USE_KEY;
 use const DIRECTORY_SEPARATOR;
@@ -153,28 +152,6 @@ class TestCase extends BaseTestCase
         return $this->getName($withDataSet);
     }
 
-    /**
-     * Compatibility alias
-     */
-    public function expectExceptionMessageRegExp(string $regexp): void
-    {
-        if (method_exists($this, 'expectExceptionMessageMatches')) {
-            $this->expectExceptionMessageMatches($regexp);
-        } else {
-            /** @psalm-suppress UndefinedMethod */
-            parent::expectExceptionMessageRegExp($regexp);
-        }
-    }
-
-    public static function assertRegExp(string $pattern, string $string, string $message = ''): void
-    {
-        if (method_exists(self::class, 'assertMatchesRegularExpression')) {
-            self::assertMatchesRegularExpression($pattern, $string, $message);
-        } else {
-            parent::assertRegExp($pattern, $string, $message);
-        }
-    }
-
     public static function assertArrayKeysAreStrings(array $array, string $message = ''): void
     {
         $validKeys = array_filter($array, 'is_string', ARRAY_FILTER_USE_KEY);
diff --git a/tests/Traits/InvalidCodeAnalysisTestTrait.php b/tests/Traits/InvalidCodeAnalysisTestTrait.php
index 0bbd2f463..daff91c92 100644
--- a/tests/Traits/InvalidCodeAnalysisTestTrait.php
+++ b/tests/Traits/InvalidCodeAnalysisTestTrait.php
@@ -81,11 +81,7 @@ trait InvalidCodeAnalysisTestTrait
 
         $this->expectException(CodeException::class);
 
-        if (method_exists($this, 'expectExceptionMessageMatches')) {
-            $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
-        } else {
-            $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
-        }
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $codebase = $this->project_analyzer->getCodebase();
         $codebase->config->visitPreloadedStubFiles($codebase);
diff --git a/tests/UnusedCodeTest.php b/tests/UnusedCodeTest.php
index f913b1211..341de7fe6 100644
--- a/tests/UnusedCodeTest.php
+++ b/tests/UnusedCodeTest.php
@@ -90,7 +90,7 @@ class UnusedCodeTest extends TestCase
         }
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $file_path = self::$src_dir_path . 'somefile.php';
 
diff --git a/tests/UnusedVariableTest.php b/tests/UnusedVariableTest.php
index 055be038d..61fdb840f 100644
--- a/tests/UnusedVariableTest.php
+++ b/tests/UnusedVariableTest.php
@@ -82,7 +82,7 @@ class UnusedVariableTest extends TestCase
         }
 
         $this->expectException(CodeException::class);
-        $this->expectExceptionMessageRegExp('/\b' . preg_quote($error_message, '/') . '\b/');
+        $this->expectExceptionMessageMatches('/\b' . preg_quote($error_message, '/') . '\b/');
 
         $file_path = self::$src_dir_path . 'somefile.php';