This repository contains a cheat sheet I wrote for myself back in 2010. I don't use Ragel often, but the several times I've used it, this cheat sheet has helped me get back up to speed quite quickly.
The cheat sheet provides a high-level survey of the Ragel system. It won't replace the manual, but it will let you knowledgeably approach that as a reference.
Since the contents of the cheat sheet were derived from the manual, and the manual was GPLv2+-licensed, this document is as well.
Good luck!
Jeremy W. Sherman 2015-03-29, Atlanta, Ga.