Created
April 12, 2020 07:19
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Get subdomain from hostname
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| /** | |
| * Extracts subdomain from hostname. Works with localhost, but not with full url with ports. | |
| * @example | |
| * getSubdomain(location.hostname); //www.google.com | |
| * // returns 'www' | |
| * @example | |
| * getSubdomain(location.hostname); //localhost | |
| * // returns 'localhost' | |
| **/ | |
| function getSubdomain(hostname) { | |
| const regexParse = new RegExp('[a-z-0-9]{2,63}.[a-z.]{2,5}$'); | |
| const urlParts = regexParse.exec(hostname); | |
| return subdomain hostname.replace(urlParts[0],'').slice(0, -1) || hostname; | |
| } |
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