Convert IPv6 Addresses to IPv4 Format IPv6 to IPv4 tool for network operations.

The tool relies on regular expressions to extract the IPv4 address from the input IPv6 address, with patterns defined in the code as /^::ffff:(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/ for dotted-decimal mapped addresses and /^::ffff:([0-9a-f]{1,4}):([0-9a-f]{1,4})$/ for hex-pair mapped addresses. These patterns are used in the extractIpv4 function to match the input string and extract the corresponding IPv4 address. The function uses JavaScript's built-in String.prototype.match method to perform the regular expression matching, and then uses bitwise operations to convert the extracted hexadecimal values to decimal IPv4 addresses.

The tool utilizes React hooks, specifically useState and useEffect, to manage state and handle side effects in a functional component. When the input changes, the useEffect hook is triggered, which splits the input string into individual lines, trims each line, and then attempts to extract the IPv4 address using the extractIpv4 function. If an error occurs during extraction, the error message is caught and stored in the result object. The results are then rendered as a list of converted addresses or error messages.

The tool also uses the copyToClipboard function from the @/lib/utils module to handle copying the converted IPv4 addresses to the clipboard when the user clicks the "Copy All" button. This function likely uses the navigator.clipboard API, which is a modern browser API for interacting with the system clipboard. The use of ES6+ features such as async/await and arrow functions ensures that the code is concise and readable.

In terms of data structures, the tool uses an array of objects to store the conversion results, where each object contains the input IPv6 address, the converted IPv4 address, or an error message if the conversion failed. This allows for efficient rendering of the results list and easy access to individual conversion results. The mobile-first responsive design ensures that the tool is usable on a variety of devices, with a layout that adapts to different screen sizes.