Filter multi select by options or groups not working

[vivekapex]

I'm trying to give the flexibility of filtering the select based on either the options or groups but the same is not happening.

Check this very example http://multiple-select-live.wenzhixin.net.cn/example/filter-group.html.
Try searching 000 in the search bar, it'll show No matches found though there is an option as 000

Any help would be appreciated. Thanks for the great plugin.

[Phynixknight]

Has any solutions?