diff --git a/src/Stringy.php b/src/Stringy.php
index ccb6f5a..f2a77d6 100644
--- a/src/Stringy.php
+++ b/src/Stringy.php
@@ -1170,7 +1170,7 @@ public function slugify($replacement = '-', $language = 'en')
 
         $stringy->str = str_replace('@', $replacement, $stringy);
         $quotedReplacement = preg_quote($replacement);
-        $pattern = "/[^a-zA-Z\d\s-_$quotedReplacement]/u";
+        $pattern = "/[^a-zA-Z\\d\\s\\-_$quotedReplacement]/u";
         $stringy->str = preg_replace($pattern, '', $stringy);
 
         return $stringy->toLowerCase()->delimit($replacement)