User:TheSteve2/regexhero

Regex Hero is a regular expression tester built in Silverlight. Since it runs the Regex Class Library built into Silverlight, it's 100% compatible with .NET regular expressions.

Features
The regular expression is evaluated against your target string after every keypress, providing instant feedback. Match mode will just highlight the matches generated by your regular expression. Replace will allow you to replace the matches with text of your choice. And split will actually replace the matches with line feeds. Clicking the ".NET" button will give you short code snippets in C# or VB.NET for easy integration into your own .NET application. As a logged in user you're able to save any regular expression you create to Regex Hero's database for your own personal storage. As a Regex Hero Professional user you can also save regular expressions to your local computer with the desktop version of Regex Hero. Test the performance of your regular expression against your target string and get an "iterations per second" figure. As you type, regex patterns are automatically suggested for you. Regex Hero can analyze and translate your regular expression into steps described in plain English.
 * Instant highlighting
 * Match, replace, and split modes
 * Generate .NET code
 * Save your regular expressions online
 * Benchmarking
 * Code completion
 * Regex analysis