I didn't at once guess to combine single and double quotation marks.

What's the point of the r? I did basically the same thing except without the r, and it worked fine.

This is beautiful

and i thought my solution was clean...

craziest :O

Very unique

In my opinion the min and max functions are overkill. But interesting solution.

this solution is so elegant

str turns the integer into a string. It's the difference between the number 55 and the string "55". To check whether the string "5" is within the number, you first have to convert the number to a string by using str.

That's why this kata is easy, and this one is not: https://www.codewars.com/kata/621f89cc94d4e3001bb99ef4

How can you solve it without creating an array?

\d+ and [0-9]+ are patters, \d+ is just a more clean and good

I've hit submit too early. No need for the first two pieces of the 'and' in the answer XD

Oh, thank you. It's really nice solution.