如何提取域名关键字?

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const testUrlReg = /((https?:\/\/)|(www\.))?(test)([\w-]*\.)?([\w-]*\.)(\w+)(\:\d+)?(\/[\w-]*)*(\?[\w-%=&]+)?(\/?#\/[^ ]*)?/i
const urls = ['https://test.baidu.com','http://test.baidu.com','https://www.test.baidu.com','www.test.baidu.com','test.baidu.com','https://www.baidu.com','www.baidu.com']
const result = urls.map(url=>testUrlReg.test(url))// [true, true, true, true, true, false, false]
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