fix: preserve Unicode characters in class names for --filter matching

src/Factories/TestCaseFactory.php

@@ -110,8 +110,8 @@ final class TestCaseFactory
         $relativePath = (string) preg_replace('|%[a-fA-F0-9][a-fA-F0-9]|', '', $relativePath);
         // Remove escaped quote sequences (maintain namespace)
         $relativePath = str_replace(array_map(fn (string $quote): string => sprintf('\\%s', $quote), ['\'', '"']), '', $relativePath);
-        // Limit to A-Z, a-z, 0-9, '_', '-'.
-        $relativePath = (string) preg_replace('/[^A-Za-z0-9\\\\]/', '', $relativePath);
+        // Limit to A-Z, a-z, 0-9, and Unicode letters.
+        $relativePath = (string) preg_replace('/[^A-Za-z0-9\\\\\\p{L}]/u', '', $relativePath);
 
         $classFQN = 'P\\'.$relativePath;
 

tests/.snapshots/success.txt

@@ -1775,6 +1775,10 @@
   - todo
   - todo in parallel
 
+   PASS  Tests\Visual\UnicodeFilename
+  ✓ filter works with unicode characters in filename
+  ✓ filter with unicode regex matches unicode filename
+
    WARN  Tests\Visual\Version
   - visual snapshot of help command output
 
@@ -1782,4 +1786,4 @@
   ✓ pass with dataset with ('my-datas-set-value')
   ✓ within describe → pass with dataset with ('my-datas-set-value')
 
-  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 39 todos, 35 skipped, 1188 passed (2813 assertions)
+  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 39 todos, 35 skipped, 1190 passed (2818 assertions)

tests/.tests/StraßenTest.php

@@ -0,0 +1,3 @@
+<?php
+
+it('tests unicode filename with ß')->assertTrue(true);

tests/Visual/UnicodeFilename.php

@@ -0,0 +1,37 @@
+<?php
+
+use Symfony\Component\Process\Process;
+
+test('filter works with unicode characters in filename', function () {
+    $process = new Process([
+        'php',
+        'bin/pest',
+        'tests/.tests/StraßenTest.php',
+        '--colors=never',
+    ], dirname(__DIR__, 2), ['COLLISION_PRINTER' => 'DefaultPrinter', 'COLLISION_IGNORE_DURATION' => 'true']);
+
+    $process->run();
+
+    $output = $process->getOutput();
+
+    expect($output)->toContain('StraßenTest');
+    expect($output)->toContain('tests unicode filename');
+    expect($output)->toContain('1 passed');
+})->skipOnWindows();
+
+test('filter with unicode regex matches unicode filename', function () {
+    $process = new Process([
+        'php',
+        'bin/pest',
+        '--filter=.*Straß.*',
+        'tests/.tests/',
+        '--colors=never',
+    ], dirname(__DIR__, 2), ['COLLISION_PRINTER' => 'DefaultPrinter', 'COLLISION_IGNORE_DURATION' => 'true']);
+
+    $process->run();
+
+    $output = $process->getOutput();
+
+    expect($output)->toContain('StraßenTest');
+    expect($output)->toContain('1 passed');
+})->skipOnWindows();