If you do a Google search for the keyword "oniguruma" you'll see some very strange results. The first few links that appear on the first page are related to the keyword oniguruma, but the rest of the pages are mostly made up of completely unrelated links. I noticed this last August. However, this may be the case only in Japan. I don't know what is going on in other parts of the world.

The rest of this article is written below.
https://kkos.fc2.net/blog-entry-1.html