Can you explain further on time complexity?
How do you know this example will be slow?

short code but the time complexity will be high

#11bfq_42w

excellent . i forgot about named group .

This is so cool :)

This was awesome. I had my head banging thinking I need to use a lookaround or something, didn't realise all you need are groups

nah.imports

Will your solution work for all domains in existence? Or is it just to pass the tests in this Kata?

Agreed.

It's not necessary to check (I+j)% == 0

Same here, great solution, thx

this solution will give you a subdomain, pay attention for it in real cases;)

Very gracefully. Thank you!

Pretty good but it is uneccessarily complex, take a look at my solution