When I added a newline to regexes checking for 'digits only', 9 out of 14 implementations passed it

I provided 14 different ways of 'checking if a string is digits only' with a string consisting of 123 followed by a newline.

Japanese for humans, alphanumeric for DNS—Behind the scenes of Japanese domains

Is "Japanese.jp" really Japanese within the DNS?Last time, we looked at the pros and cons of Japanese domains. During that ...