RegExr, a tool for learning, testing and editing regular expressions on Mac OSX, Windows and Linux.
Available with Desktop and Online version. Its build with Flex3, and uses ActionScript 3’s built in RegExp engine.
Desktop version run with Adobe Air. You have to download and install the adobe air to run the desktop app.
Online Version: http://gskinner.com/RegExr/
Desktop Version: http://gskinner.com/RegExr/desktop/
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