We have received several requests to make the source code for our regex generator by examples tool public.
We were reluctant to do so because we cannot offer any support, but eventually we decided to make it public: https://github.com/MaLeLabTs/RegexGenerator
The engine is a developement release that implements the algorithms published in our articles:
More details about the project can be found on http://machinelearning.inginf.units.it/news/newregexgeneratortoolonline.
We hope that you find this code instructive and useful for your research or study activity.
If you use our code in your reasearch please cite our work and please share back your enhancements, fixes and modifications.