Puroguramingu Perl (Tankobon Hardcover)

The book dives into complex aspects of Perl that aren't always intuitive. I wonder what motivated the emphasis on those particular topics.

The way regular expressions are broken down felt especially accessible, which is rare. Has anyone used this as a reference for tricky pattern matching?

The progression from basics to advanced topics seems carefully structured. I'm curious whether this was a linear plan or evolved during writing.