That was one of the short examples in Norvig's Python program-design course for Udacity. https://github.com/darius/cant/blob/master/library/regex-gen.cant https

That was one of the short examples in Norvig's Python program-design course for Udacity. https://github.com/darius/cant/blob/master/library/regex-gen.cant https://github.com/darius/cant/blob/master/library/regex-gen... (I don't have the Python handy.)