Find All Email Addresses in Your Text Extract all email addresses from text and list unique results.

The Email Extractor tool relies on a regular expression pattern to identify email addresses within input strings, using React's useCallback hook to memoize the processing function and prevent unnecessary re-renders. This regex pattern, /[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/g, is designed to match most common email address formats by allowing alphanumeric characters, dots, hyphens, underscores, and plus signs in the local part, as well as multi-level domain names. When a match is found, JavaScript's String.prototype.match method returns an array of matches, which can then be processed further.

To remove duplicate emails from this array, the tool uses a Set data structure, specifically the spread operator [...new Set(matches)], to create a new array containing only unique email addresses while preserving their original order. This deduplication step is crucial for ensuring that each extracted email address appears only once in the output list. The count of unique emails is then displayed in the output header using template literals, providing users with a clear indication of how many email addresses were extracted from the input text. Under the hood, the tool utilizes React's TextToolLayout component to handle user input and display the extracted emails in a clean and readable format.

In terms of browser APIs, the Email Extractor does not rely on any specific external libraries or frameworks beyond what is provided by React and JavaScript itself. The use of TypeScript, as indicated by the .tsx file extension, provides additional type safety and helps catch errors at compile-time rather than runtime. By combining these technologies and techniques, the tool is able to efficiently extract email addresses from input strings and display them in a user-friendly format, making it easier for developers and data analysts to work with unstructured text data. The output of the tool is a plain text list of unique email addresses, one per line, which can be easily copied and pasted into other applications or used for further processing.