diff --git a/tests/DiffHelperTest.php b/tests/DiffHelperTest.php
index de13044..2ea5886 100644
--- a/tests/DiffHelperTest.php
+++ b/tests/DiffHelperTest.php
@@ -94,7 +94,7 @@ public static function provideRendererOutputCases(): iterable
     protected static function findRendererOutputTestFiles(string $rendererName): array
     {
         $rendererNameRegex = preg_quote($rendererName, '/');
-        $fileNameRegex = "/{$rendererNameRegex}-(?P<idx>[0-9]+)-(?P<name>[^.\\-]+)\\.txt$/u";
+        $fileNameRegex = "/{$rendererNameRegex}-(?P<idx>[0-9]+)-(?P<name>[^.-]+)\\.txt$/u";
 
         $finder = (new Finder())
             ->files()