I wondered why there were so few course reviews, but after seeing the lecture, I understand. Overall, I feel like the lecture is conducted without much preparation. There is a lot of silence, and sometimes you encounter errors while writing. Aside from other things, this is the first time I've seen someone teach regular expressions like this. In any case, the basics of regular expressions are explained for the first time, and the communication skills are very poor. When you look at the sheet you made, do you really think that this is an explanation that will stick in other people's heads? You only show examples, and the examples aren't all in the sheet. The lecture is lacking, and the completeness of the materials is lacking. And I don't really understand why you have to request lecture materials by email. Sites like Coursera, Udemy, and Fastcampus don't share materials like this. The same goes for domestic middle and high school lecture sites.