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JavaScript

const referrer = 'https://www.google.com/search?q=search&oq=search&gs_lcrp=EgZjaHJvbWUyDwgAEEUYORiDARixAxiABDIHCAEQABiABDIHCAIQABiABDIHCAMQABiABDIHCAQQABiABDIHCAUQLhiABDIGCAYQRRg8MgYIBxBFGDzSAQc3NDFqMGo3qAIAsAIA&sourceid=chrome&ie=UTF-8'; //cannot write to document.referrer and referrer in jsfiddle is small and uncomplex, using this as a complex example url

const referrerUrl = new URL(referrer);
console.log(referrerUrl.hostname); // --> www.google.com

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