Pattern Matching is already one of the essential features in Ruby, but not everyone knows how it is implemented. In this talk, I will show not only how it is, but also explain how to read and understand the specific feature's implementations in Ruby's C source code. Moreover, I'm going to try improving Pattern Matching on speed(the result is not guaranteed...). I will also show how to do it, and how to measure it. I hope this talk will be an opportunity to get Ruby programmers who are not familiar with the C language interested in Pattern Matching and Ruby implementation!