Hmm, the explanation part does part of what you're asking. However, I don't know of any straight forward documentation that I can link to that will explain each

Hmm, the explanation part does part of what you're asking. However, I don't know of any straight forward documentation that I can link to that will explain each and every one of these tokens. I have just read through pcre.txt many times and implemented stuff from there. If you know a source I can use I will look into it.