Ultrapico .NET regex editor
Expresso is an Ultrapico .NET regex development and testing tool distributed free of charge (a free registration is required after the first month of usage). It features a powerful regex editor suitable as a self-study tool for beginners and as a full-featured development environment for the experienced programmers with an profound knowledge of regular expressions. Besides, there are such features as .NET code generation, benchmarking, and a local regex library.