How to use 'regex for website url' in JavaScript

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35function isGuardianWebsiteUrl(url: string) {
36 return matchHostname(url, [
37 urlConstants.base.mainDomain,
38 urlConstants.base.mainDomainShort
39 ]);

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36function subdomainRegex(baseUrl){
37 var regex;
39 baseUrl = _escapeRegExp(baseUrl);
41 regex = new RegExp('((?!www)\\b[-\\w\\.]+)\\.' + baseUrl + '(?::)?(?:\d+)?');
43 return regex;

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