what i want to make

I want to make a rich text editor(using contenteditable div, and execcommand()). It works just fine but if i copy content from other websites with unclosed html tags and paste it to the contenteditable div, and upload it, the uploaded content messes up my website

what i am trying to find

I am trying to find a way to remove the unclosed html tags

what i tried

I tried the jquery htmlclean plugin. It didn't work for some reason.