diff --git a/lib/Config.php b/lib/Config.php
index 65f0090..8958d51 100644
--- a/lib/Config.php
+++ b/lib/Config.php
@@ -68,7 +68,6 @@ final class Config extends PhpCsFixerConfig
         'single_line_throw'                                 => false,
         'space_after_semicolon'                             => true,
         'static_lambda'                                     => false,
-        'string_implicit_backslashes'                       => ['single_quoted' => 'escape'],
         'unary_operator_spaces'                             => false,
         'use_arrow_functions'                               => false,
     ];
diff --git a/lib/FinalInternalClassFixer.php b/lib/FinalInternalClassFixer.php
index b8f4a24..015aac3 100644
--- a/lib/FinalInternalClassFixer.php
+++ b/lib/FinalInternalClassFixer.php
@@ -14,7 +14,7 @@
 
 final class FinalInternalClassFixer extends AbstractFixer
 {
-    private const REGEX = '(?:final|\\\\Doctrine\\\\ORM\\\\Mapping\\\\Entity|ORM\\\\Mapping\\\\Entity|ORM\\\\Entity|Entity)';
+    private const REGEX = '(?:final|\\\Doctrine\\\ORM\\\Mapping\\\Entity|ORM\\\Mapping\\\Entity|ORM\\\Entity|Entity)';
 
     public function getDefinition(): FixerDefinitionInterface
     {
@@ -83,7 +83,7 @@ private static function isDoctrineEntity(Tokens $tokens, int $classIndex): bool
             for ($index = $attributeOpenIndex; $index < $classIndex; ++$index) {
                 $content .= $tokens[$index]->getContent();
             }
-            if (1 === \preg_match(\sprintf('/^#\\[%s/', self::REGEX), $content)) {
+            if (1 === \preg_match(\sprintf('/^#\[%s/', self::REGEX), $content)) {
                 return true;
             }
 
diff --git a/tests/AbstractFixerTestCase.php b/tests/AbstractFixerTestCase.php
index c05deff..e7931ad 100644
--- a/tests/AbstractFixerTestCase.php
+++ b/tests/AbstractFixerTestCase.php
@@ -27,7 +27,7 @@ protected function setUp(): void
     final protected function createFixer()
     {
         $fixerClass = static::class;
-        $fixerClass = \str_replace('\\Tests\\', '\\', $fixerClass);
+        $fixerClass = \str_replace('\Tests\\', '\\', $fixerClass);
         $fixerClass = \preg_replace('/Test$/', '', $fixerClass);
 
         return new $fixerClass();
diff --git a/tests/FunctionReferenceSpaceFixerTest.php b/tests/FunctionReferenceSpaceFixerTest.php
index 299cb9f..33ba5e7 100644
--- a/tests/FunctionReferenceSpaceFixerTest.php
+++ b/tests/FunctionReferenceSpaceFixerTest.php
@@ -26,7 +26,7 @@ public static function provideCases(): array
             $use = \str_replace(' = array()', '', $use);
             $use = \str_replace('$array', '$secondArray', $use);
 
-            $invariant = \PHP_EOL . \preg_replace('/\\s+/', ' ', '
+            $invariant = \PHP_EOL . \preg_replace('/\s+/', ' ', '
                 $var =&  $var;
                 $var =& $var;
                 $var =&$var;