Find and List All Hashtags in Your Text Extract all #hashtags from text and list unique results.

The extractor's core functionality relies on a regular expression, specifically `/#[a-zA-Z0-9_\u00C0-\u024F]+/g`, which is applied to the input string using JavaScript's `match` method. This regex pattern matches the # symbol followed by one or more alphanumeric characters, underscores, or accented Latin characters, covering a wide range of possible hashtag formats. The `g` flag at the end of the regex ensures that all occurrences in the string are matched, not just the first one. When applied to the input text, this pattern allows it to accurately identify and extract hashtags.

Under the hood, the tool uses React's `useCallback` hook to memoize the `onProcess` function, which prevents unnecessary re-renders of the component when the input text changes. The extracted hashtags are then stored in a JavaScript Set data structure, which automatically removes duplicates while preserving the order of first appearance. This is achieved by creating a new Set from the array of matched hashtags and then converting it back to an array using the spread operator (`[...new Set(matches)]`). Finally, the unique hashtags are joined into a single string with each tag on a new line using the `join` method.

The output format includes a total count of unique hashtags found, which is displayed in the output header. This count is calculated by checking the length of the `unique` array after deduplication. If no matches are found, it returns a message indicating that no hashtags were detected in the input text. The tool's layout and user interface are handled by the `TextToolLayout` component, which provides a standard template for text-based tools, including an input field with a placeholder and an output label.