FWIW... Better explanations in http://neilk.net/blog/2000/06/01/abigails-regex-to-test-for-prime-numbers/ http://neilk.net/blog/2000/06/01/abigails-regex-to-te

FWIW... Better explanations in http://neilk.net/blog/2000/06/01/abigails-regex-to-test-for-prime-numbers/ http://neilk.net/blog/2000/06/01/abigails-regex-to-test-for-... Abigail's other regular expression hacks https://metacpan.org/author/ABIGAIL?sort=[[3,1] https://metacpan.org/author/ABIGAIL?sort=[[3,1]]