JSFiddle - React, Tailwind, and code Playground

HTML

<script>
baseUrl="https://example.com/AAA/BBB/CCC?DDD#EEE";
if (/^[^:]+:\/\/\/?[^\/]+\//.test(baseUrl)) {
	baseUrl = baseUrl.replace(/[\?#].*$/, '').replace(/[\/\\][^\/]+$/, '');
	if (!/[\/\\]$/.test(baseUrl)) {
		baseUrl += '/';
	}
}
alert(baseUrl);
</script>