Rad Software Regular Expression Designer is a free download that helps programmers learn, develop and test Regular Expressions. It is an interactive Windows application that is designed to be simple and easy to use.
Features:
The RegEx match results are listed in a tree with levels for Matches, Groups and Captures. Clicking on a Match, Group or Capture will Highlight it in the Input text window
Regex.Replace is supported and the results of the replace are listed in a separate window.
The Language Element window is an embedded reference that gets you up to speed quickly. Click on an item to see a description in the pane below, double-click a language element to add it to your Regex
Find text in any of the text windows with Ctrl+F
Flexible interface with dockable windows
Now supports very large values for the input text
