Introduction

Meziantou.Framework.Uri gathers helpers to work with URLs in .NET:

URL patterns: an implementation of the WHATWG URL Pattern standard, the pattern syntax browsers use (https://*.example.com/books/:id). Test whether a URL matches a pattern and extract the values of its groups.
Query strings: parse a query string into names and values, and add, replace or remove parameters of a URL.
Public Suffix List: find the public suffix (co.uk) and the registrable domain (example.co.uk) of a host name, from a snapshot of the Public Suffix List compiled into the assembly.

What you can do with it

Route or filter URLs with patterns that read like URLs, instead of regular expressions. See Matching URLs and Pattern syntax.
Find which pattern of a list matches a URL, such as the route of a request. See Pattern collections.
Build URLs by adding, replacing and removing query string parameters, with the values encoded for you. See Query strings.
Decide whether two hosts belong to the same site, or which part of a host name a registrant controls, for cookies, security checks or grouping URLs by site. See Public Suffix List.