Regexenator is a free Android app developed by Seven Bit Software LLC that allows you to create, test, and evaluate regular expressions. With its user-friendly interface, Regexenator is suitable for both beginners and experts in regular expressions. The app's Replacement feature enables you to find and replace text using your regular expressions quickly.

Regexenator comes with a Cookbook that provides example regular expressions and test cases, and a Catalog of regular expression special characters and sequences and their usages. It also supports multiple tests for each regex, and a built-in share feature to email the regex to your work address, text it to a co-worker, or copy it to the clipboard.

The app also includes Configurable Quick-Entry buttons for characters not readily available via keyboard, settings that allow multiline expressions, case insensitive, and the ability to save regular expressions, replacement expressions, and tests. It supports the Java regular expression library, as supported by Pattern and Matcher, and is a great Regex evaluation tool for tablets.

Overall, Regexenator is a powerful yet simple regular expression tool that provides excellent features and functionality. The app is constantly updated with new features to improve its usefulness. If you need a reliable and user-friendly app for regular expressions, Regexenator is an excellent choice.