Sigh.

Do we have an understanding, that ' ' and '\u0020' are the same thing in a pattern?

0 testcases of spaces and a tab.. Then maybe Blind4Basics fixed that? Great.

You may be missing my point, I use \t to communicate a presence of a tab, since it gets converted to a space when we type it here in comments. I use it in regexp because test made me do so, not because I do not know what it does.

I'll try to express without backslashes:
There are test cases that reject a tab between parts an others that require two spaces followed by a tab to be accepted.
That means this can't be expressed as ie. single space in regexp. What I suggest is to check the test cases because it does not seem right... and also there is nothing about whitespace in the instructions, which I think should be since test cases include nuances in whitespace.

Hope its clearer, thanks.

@Blind4Basics Java, apparently full numbers, dont have exact message, it was the one globally rejecting input

@Helral.. yeah, what do I know what kind of sneaky space-like chars are or are not part of the test suite :)... used for debugging, forgot to remove. There was no \t in the regexp, I assumed its more readable than ' '.

My solution got quite weird as tests required '+21\t45 567890' to be rejected and '+21 \t45 567890' to be accepted. Why? In general, these 'features' should be described in instructions section, not discovered through tests...