diff --git a/src/Kris/LaravelFormBuilder/RulesParser.php b/src/Kris/LaravelFormBuilder/RulesParser.php
index e0bb9ce..6f7452e 100644
--- a/src/Kris/LaravelFormBuilder/RulesParser.php
+++ b/src/Kris/LaravelFormBuilder/RulesParser.php
@@ -175,7 +175,7 @@ protected function numeric()
         }
 
         return [
-            'pattern' => '[-+]?[0-9]*[.,]?[0-9]+',
+            'pattern' => '[\\-+]?[0-9]*[.,]?[0-9]+',
             'title' => $this->getTitle('numeric'),
         ];
     }