解析域/主机名的字符串 [英] Parsing string for Domain / hostName

问题描述

外出客户可以从域名进入网站.他们还可以从他们的联系人输入邮件地址.

Out customers can enter websites from domain names. They also can enter mailadresses from their contacts.

知道我们需要找到哪些网站的客户可以将其域与邮件地址的域相关联.

Know we need to find customers which websited whoose domain can be associated to the domains of the mailadresses.

所以我的想法是从 webadress 和 url 中提取主机并比较它们

So my idea is to extract the host from the webadress and from the url and compare them

那么从 url 获取主机名的最可靠算法是什么?

So what's the most reliable algorithm to get the hostname from a url?

例如一个主机可以是:

foo.com
www.foo.com
http://foo.com
https://foo.com
https://www.foo.com

结果应该总是 foo.com

The result should always be foo.com

推荐答案

与其依赖不可靠的正则表达式，不如使用 System.Uri 为您进行解析.使用这样的代码:

Rather than relying on unreliable regex use System.Uri to do the parsing for you. Use a code like this:

string uriStr = "www.foo.com";
if (!uriStr.Contains(Uri.SchemeDelimiter)) {
    uriStr = string.Concat(Uri.UriSchemeHttp, Uri.SchemeDelimiter, uriStr);
}
Uri uri = new Uri(uriStr);
string domain = uri.Host; // will return www.foo.com

现在获取您可以使用的顶级域:

string tld = uri.GetLeftPart( UriPartial.Authority ); // will return foo.com

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