How to manipulate a string and parse a url

Question

Let's say I have a list of random URLs, the URLs are fully formed:

http://www.example1.com, http://example2.biz, http://www.example3.co.uk 

and I have the value My url from the text box and dropDownList for urlSufix

so the user inserts the url:

label: www. , textBox [insert the domainNameOnly] , DDL [.com, .biz, .co.uk, .net, .info]

and say the user typed "example3" and selected sufix ".biz"

so my value is "example3.biz"

I need a method to compare URLs in a list for user input

I thought I just split the string ('.')

therefore the parameters for the prefix:

 www.example 

or simply

 example 

for sufix

 example.com \ biz \net \info -> (2 parts) example.co.uk \org.uk (3 parts) 

so you have many options

may be prefixed with aray has 2 elements

 www.example 

and sufix with 3 example.co.uk

hard to check it

I chose the wrong path using compareisson techniq to split the urls into dots?

I will just show you how I started, and I stopped as soon as I noticed that it was too much.

it does not cover all parameters and is already too complicated

 if (ListArr[0] != "www") { // it means no www so compare userArr[0] to ListArr[0] // to check domainMatch // and for suffix of domain var DDLValueArr = DDLValue.split('.'); if(DDLValueArr.length > 1) means it is co.uk or org.uk etc' { compare DDLValueArr[0] to ListArr[1] } } else compare userArr[0] to ListArr[1] cause the url in the List starts with "www" 

What is a good approach for comparing user data with a list of URLs?

Answer 1

You can use the Uri class and UriBuilder to create uri, for example:

 List<Uri> uris = new List<Uri>(){ new Uri("http://www.example1.com"), new Uri("https://www.example2.biz"), new Uri("http://www.example3.co.uk") }; string input = "www.example2.biz"; Uri newUri = new UriBuilder(input).Uri; if (uris.Any(u=> u.Host == newUri.Host)) { MessageBox.Show("Already in the list"); } 

Note that if uri does not specify a scheme, UriBuilder defaults to "http:".