JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="test_textarea" style="width: 200px; height: 200px;"></textarea>

JavaScript

$('#test_textarea').keyup(function () {
	           var new_stuff = $(this).val();
	               new_stuff = new_stuff.replace(/[\n\r]+/g,""); // clean out newlines, so we dont get dups!
	           var test = new_stuff.replace(/(.{10})/g,"$1\n");
	           $(this).val(test);
	        });