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Quick & dirty ugly chain if you don't want to research regex:
const domainName = (domain) => domain.split('://')[1].split('/')[0].includes('www.') ? domain.split('://')[1].split('/')[0].split('www.')[1].split('.')[0] : domain.split('://')[1].split('/')[0].split('.')[0]
Quick & dirty ugly chain if you don't want to research regex: