RegexDesigner.NET

RegexDesigner.NET is a free tool to design and test regular expressions. You can also generate C# or VB.Net code. Features: Interactive matching of .NET regular expressions. Syntax highlighted match results, including zero-length matches and hidden characters. Tooltips to display matched groups. Regular expression matching, replacing and splitting. Regular expression projects to save expressions, text to match and all regex options. Full code generation for C# and VB.NET for all regex operations. Compiled assembly generation. Full online help. Full source.