snort-lib is a set of example Snort rules. It’s a short one, about 43 rules total, but it gives a good overview of the basic rule types and how to use the pattern matcher properly.
You can download it from the following link: https://packetstormsecurity.com/files/download/14473/snort-lib
Source: https://packetstormsecurity.com/files/14473/snort-lib.html