Method for comparing URLs with the same root-CodePudding

I am looking into trying to compare 2 URLs in C# for equal root domains, I.E.

sub.example.com matches example.com and othersub.example.com.

I had a look into using the Uri class, but that will parse the full URL including the subdomains.

I had thought about splitting the string at each . and then comparing the last 2 last elements which would normally be the root domain name, however that causes issues as often the TLD can also have a subdomain I.E. example.com.au would then match other.com.au.

I guess I'm hoping if anyone knows a NuGet library that can take into account common top level domains (including multi part ones) and then compare the actual specified domain

CodePudding user response：

You can use Nager.PublicSuffix package.

Install via nuget:

PM> Install-Package Nager.PublicSuffix

Example:

var domainParser = new DomainParser(new WebTldRuleProvider());

var domainInfo = domainParser.Parse("sub.test.co.uk");
//domainInfo.Domain = "test";
//domainInfo.Hostname = "sub.test.co.uk";
//domainInfo.RegistrableDomain = "test.co.uk";
//domainInfo.SubDomain = "sub";
//domainInfo.TLD = "co.uk";

Then compare via the domainInfo.TLD