issue 719: fixed numeric pattern (#720)

Co-authored-by: Janusz Paszyński <[email protected]>

Author: Eloar

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'),
         ];
     }