Regular Expressions matching top-level domain names

Recently, for Internet projects, you need to extract the primary domain name from the URL and find a lot from the Internet. Most of them are just from http: // query domain names/For http://youa.baidu.com/,http://www.baidu.com/ http://baidu.com/and so on can not extract baidu.comthis kind of main domain name.

After several modifications, we finally found one:

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RegEx REX = new RegEx (@"(? <=: // [/W-] +/.) ([/W-] +/.) + [/W-] + (? <= /?) ", Regexoptions. Compiled | regexoptions. ignorecase );

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