It is too easy for 2 kyu, also i disagree with some terms, like a|t|y should be allowed in a real praxis, - it is Or(Normal(a), Normal(t), normal(y))
Well, (ab)a should concatenate to aba, what is not issue in the test. good point here someone, a** should NOT be allowed only for users check, because it is kinda valid regex theoretically, empty regex should return Empty() token.

Try to do something more with this funtion like calculating it on very large scale where hashing is not working, because hashing is really trivial

Omg this is so hardcore.
I needed to dig into really advanced math hacks.
Finally i discovered good pure- math move to calculate this significally less then limited time - below 4 seconds, in Python and i am finally satisfied :D

Is it known transportation task problem with known solution, what does not work always,
or else you may invent some approximate solution, but it will require longer time.
Lets see :D

Ok i just needed to rename all open_ variable. Ok i did it, you could delete it my comment

oh yes i corrected it, sorry.
now the tests are fine, but i have the issue You can't use open, open, open: ['open', 'open', 'open'] should equal []
And i do not use open funciton

First of all, one of the test is wrong,
("10- 2- -5", 13),
should be equal to 3 : 10 - 7 and not 13

what is 'g' doing here, i have not found it in doku

you do not capitalize the first character

ah so you have not concidered the different order of qualities :D

also, is there any operator like any(quality1,quality2) ='evil' - this does not work with columns here

Too big, it is possible to make the pattern shorter

it is not really clever, since you iterate over all values, and not just once over intevrals, like in by solution

from the launching, i realized that you must not concider the LEAP YEAR, what was really embarassing to me, since i DID concider that - commented out in my solution