Fix special characters in parsing serial numbers

Author: teodino93

src/SerialNumberGenerator.php

@@ -163,6 +163,8 @@ public function parse(string $serialNumber): array
 
     protected function formatToRegex(): string
     {
+        $format = preg_replace('/([^\w\s])/i', '\\\\$1', $this->format);
+        
         $value = preg_replace_callback_array(
             [
                 '/P+/' => fn ($matches) => ($matches[0] && $length = mb_strlen($matches[0])) ? "(?<prefix>[a-zA-Z]{{$length}})" : '',
@@ -171,7 +173,7 @@ protected function formatToRegex(): string
                 '/Y+/' => fn ($matches) => ($matches[0] && $length = mb_strlen($matches[0])) ? "(?<year>\d{{$length}})" : '',
                 '/C+/' => fn ($matches) => ($matches[0] && $length = mb_strlen($matches[0])) ? "(?<count>\d{{$length}})" : '',
             ],
-            $this->format
+            $format
         );
 
         return is_string($value) ? $value : '';