I see a lot of criticism but not a lot of praise. For me creating something so comprehensive and also easy to use is an achievement. And in my opinion this is much better than Regex for most cases because of the ease of use and readability. I think the main pushback you are seeing is just because people are invested in Regex.
Um.. no? He is seeing pushback because one of his main claims (100x faster) is very likely factually wrong. And also because he is not even acknowledging all other prior art in this space.
