diff --git a/comicpress_manager_library.php b/comicpress_manager_library.php
index 9f8dcad..5947190 100644
--- a/comicpress_manager_library.php
+++ b/comicpress_manager_library.php
@@ -167,7 +167,9 @@ function cpm_breakdown_comic_filename($filename, $allow_override = false) {
                                                        "m" => '[0-9]{2,2}',
                                                        "d" => '[0-9]{2,2}'));
 
-  if (preg_match("/^(${pattern})(.*)\.[^\.]+$/", $filename, $matches) > 0) {
+  $pattern = preg_quote($pattern, "#");
+
+  if (preg_match("#^(${pattern})(.*)\.[^\.]+$#", $filename, $matches) > 0) {
     list($all, $date, $title) = $matches;
 
     if (strtotime($date) === false) { return false; }