Once again convinced that regex patterns are powerful instrument

Because all of languages are only examples, and they don't mean anything special here.

Thanks! That was an inteesting one.

The only thing that confused this type of database list or dict. The author does not give a direct indication of the database typing.

I like to solve such tasks, I spent about 2 hours on the last ISBN10 calculation task, I won’t say that my calculation is optimal, but I always try to write my code more understandable for everyone, even if it eats a little more memory, but the experience is adaptation and optimization comes with age.