fix: link email validate format regex

app/controllers/link.cr

@@ -28,7 +28,7 @@ module App::Controllers::Link
       link.user = user
 
       loop do
-        slug = Random::Secure.urlsafe_base64(4).gsub(/[^a-zA-Z0-9]/, "")
+        slug = Random::Secure.urlsafe_base64(5).gsub(/[^a-zA-Z0-9]/, "")
         if !Database.get_by(Link, slug: slug)
           link.slug = slug
           break

app/models/link.cr

@@ -17,6 +17,6 @@ module App::Models
     unique_constraint :slug
 
     validate_required [:slug, :url]
-    validate_format :url, /\A(?:https?:\/\/)?(?:[\w-]+\.)+[\w-]+(?:\/\S*)?/
+    validate_format :url, /\Ahttps?:\/\/(?:[\w.-]+)(?::\d+)?(?:[\/?#]\S*)?\z/i
   end
 end