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.

The body of my automated Facebook posts was only 13 characters long. 103 posts, 27 days

I was automatically posting tips to English learning groups on Facebook every day. From the time I started on August 30th ...