I close the issue because I posted the solution and did not wait for feedback for several weeks.

I close the issue because I posted the solution and did not wait for feedback for several weeks.

I close the issue because I posted the solution and did not wait for feedback for several weeks.

What is the status of this issue?

What is the status of this issue?

@voile

Invalid regex handling is not specified, e.g ?invalid, *invalid and +invalid. They don't even satisfy the grammar provided by the kata description, and still expects some matches, so what is expected?

OK, now expressions like /?invalid/, /*invalid/ and /+invalid/ invalid and must raise error.
I've changed description.

Changed to:

"[0-9]{3} USD"

generator must return only characters with ascii codes between 32 and 125

But there is [0-9]{3}€ and [0-5]?[0-9]€ in the tests. € is a Unicode character (\u20ac).

Fixed. Thanks!

Fixed. Thanks!

\\d is [0-9], aka (0|1|2|3|4|5|6|7|8|9).

When you do something like (a|b)+, it's matching (a|b) 1 or more times, and because (a|b) is an alternative, it can match either at every step; think of it as (a|b)(a|b)(a|b).... So aab, a, bbb all matches (a|b)+. You can verify this with any regex implementation (and is in fact how it should be understood).