Expresso

Expresso is a full-featured development environment for the experienced programmer or web designer with an extensive knowledge of regular expressions. It features build complex regular expressions by selecting components from a palette, test expressions against real or sample input data, display all matches in a tree structure, showing captured groups, and all captures within a group, build replacement strings and test the match and replace functionality, highlight matched text in the input data, test automatically for syntax errors, and generate Visual Basic, C#, or C++ code.

Requirements:

.NET Framework 2.0 or later