diff --git a/_plugins/domain_name.filter.rb b/_plugins/domain_name.filter.rb
index eef3a61..c2c8eef 100644
--- a/_plugins/domain_name.filter.rb
+++ b/_plugins/domain_name.filter.rb
@@ -4,7 +4,7 @@ module DomainNameFilter
 
   # Return the url's domain name
   def domain_name(url)
-    return url.sub(%r{([a-z]+?://)?([^/]*)(/.*$)?}i, '\\2')
+    return url.sub(%r{([a-z]+://)?([^/]*)(/.*$)?}i, '\\2')
   end
 
 end