# Rules language

import { DirectoryListing } from "~/components";

The Cloudflare Rules language is a flexible and intuitive specification for building rule expressions. Based on the widely known [Wireshark display filters](https://www.wireshark.org/docs/wsug_html_chunked/ChWorkBuildDisplayFilterSection.html), the Rules language allows you to precisely target HTTP requests with a syntax and semantics familiar to security engineers.

Refer to the following pages for more information about the available language elements:

<DirectoryListing />