I encourage you to re-read the article: you check that the number does not match the regex:
> Is 7 prime?
>
> To know this, the function first generates “1111111” (from “1” \* 7) and tries to
> see if that string does not match /^1?$|^(11+?)\1+$/. If there is no match, then
> the number is prime.
>
> Notice that the regular expression has two parts (separated with the vertical bar |).
>
> The first part is /^1?$/ is trivial and matches with beginning of line (^), an
> optional 1 (1?) and end of line ($) which implies that it matches either the
> empty string or “1”. This simply indicates that calling that function with n==0
> or n==1 will correctly return false (as the “1” \* n will match with the first
> part of the regular expression)
I agree that the article formatting is a bit misleading.
The dog wears a harness, and a strap clips into the buckle seat and onto the harness. When you get where you're going, you unclip the strap from the harness, clip on the leash, and off you go.
I'm not the person you asked, but if I had to guess, I'd guess [beeminder]: goal-tracking software where if you don't reach your goal, they charge your credit card. Each time you fail, you get charged more. It's really good!
I agree that the article formatting is a bit misleading.