Extract and List All Links from Markdown Documents Extract all links from Markdown text including inline and reference links.

The tool's algorithm relies on three distinct regular expression patterns to identify Markdown link formats. It uses the `useCallback` hook from React to memoize the `onProcess` function, which takes an input string and returns a list of extracted links. The first regex pattern, `\[([^\]]*)\]\(([^)]+)\)/g`, matches inline links by capturing the link text and URL, allowing for optional link text. This pattern is used in conjunction with the `exec` method to iterate over all matches in the input string.

When processing reference link definitions, it uses the `/^\[([^\]]+)\]:\s*(.+)$/gm` regex pattern, which captures the reference label and URL. The `^` symbol ensures that only lines starting with a reference definition are matched, while the `gm` flags enable multiline matching. For bare URLs enclosed in angle brackets, the `/<(https?:\/\/[^>]+)>/g` regex pattern is used, treating them as auto-links.

The extracted links are stored in an array and returned as a formatted string, including the URL and its associated text, reference label, or auto-link indicator. The `TextToolLayout` component from the `@/components/shared` module is used to render the input field, output label, and extracted links. The tool preserves duplicate URLs since the same URL may appear with different link texts, allowing users to audit documentation links or create link inventories.

The use of React's `useCallback` hook optimizes performance by preventing unnecessary re-renders of the component when the input string changes. The regular expression patterns used are compatible with most Markdown implementations, making it a reliable tool for extracting links from Markdown documents. Additionally, the tool's output format is easily machine-readable, allowing for further processing or integration with other tools and scripts.