Extract Domain Names from URLs and Text Domain Extractor tool for network operations.

The tool works by utilizing the `URL` API in browsers to break down input URLs into their constituent parts, such as hostname, protocol, and pathname. It then applies a custom algorithm to extract the registrable domain, subdomain, and top-level domain (TLD) from the hostname. This algorithm checks if the second-last part of the domain is in a predefined list of known second-level domains, stored in the `KNOWN_SECOND_LEVEL` array, to handle country-code second-level domains (ccSLDs) like co.uk or com.au. The `extractDomain` function returns an object containing the extracted domain information, including any errors that may have occurred during processing.

The tool uses React hooks, specifically `useState`, `useCallback`, and `useMemo`, to manage state and optimize performance. It stores input URLs in a state variable `input` and updates the `results` state variable whenever the input changes. The `results` state variable is an array of objects, where each object represents an extracted domain with its corresponding information. The tool also uses the `copyToClipboard` function from the `@/lib/utils` module to handle copying extracted domains or full reports to the clipboard.

In terms of data structures, the tool relies on arrays and objects to store and manipulate domain extraction results. It uses the `split` method to divide input URLs into individual lines and the `map` method to apply the `extractDomain` function to each line. The resulting array of extracted domains is then filtered and sorted using various array methods, such as `filter` and `some`, to handle errors and display the results in a user-friendly format.

The tool's interface is built using React components, including `InputWithHelp` from the `@/components/shared` module, which provides a text area for inputting URLs and a help text displaying instructions on how to use the tool. The interface also features buttons to copy extracted domains or full reports, which are implemented using React hooks and browser APIs like the `copyToClipboard` function. Overall, the tool's architecture is designed to provide a fast, efficient, and user-friendly domain extraction experience, leveraging modern web technologies like JavaScript, React, and browser APIs.