- https://legacy.gitbook.com/book/learnbyexample/perl-introduction/details
- https://www.oreilly.com/library/view/learning-perl-8th/9781492094944
- https://learning.oreilly.com/videos/modern-perl-best/9781491910719
- https://learning.oreilly.com/videos/understanding-regular-expressions/9781491996300
- https://devtut.github.io/perl
- https://github.com/manwar/design-patterns
- https://www.bugcrowd.com/blog/how-to-regex-a-practical-guide-to-regular-expressions-regex-for-hackers
- How Regexes Work
- https://learnbyexample.github.io/curated_resources/perl.html
- https://github.com/avar/private-dan-carlin-hardcore-history-podcast-feed
- https://www.perl.com/article/extracting-the-list-of-o-reilly-animals + https://gist.github.com/briandfoy/d68915eb425e1fc4932ceac5cdf2d60d + https://www.oreilly.com/animals.csp
- cloc counts blank lines, comment lines, and physical lines of source code in many programming languages