The author, Russ Cox, has a whole series of articles on the topic of regex - https://swtch.com/~rsc/regexp/ https://swtch.com/~rsc/regexp/ The rust Regex crate

The author, Russ Cox, has a whole series of articles on the topic of regex - https://swtch.com/~rsc/regexp/ https://swtch.com/~rsc/regexp/ The rust Regex crate docs even refer to his posts as a reference since the rust version is based on his efficient RE2 Regex implementation at Google.