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Welcome to Expression, the simple regular expression testing tool.

Expression is written in JavaScript and HTML5 using TideSDK. If you're new to Expression and just want to ist I recommend to use one of the provided binary packages for Windows, Linux and Mac OS X. Follow the guide on how to use Expression to get started.

If you want to compile Expression from source to get the latest and greatest (non-stable) version of Expression, follow the guide on how to compile Expression from source.