Task 11 - Contradictory error messages?

[Startrekzky]

Question

Question 1

I was doing task 11:

• When I tried this ^[+-]?\d*(?:[\.,]\d*e?[+-]?\d+)?$, it said Test 34/93: A trailing dot or comma must be allowed.
• Then I tried this ^[+-]?\d*[.,]?\d*(?:[\.,]\d*e?[+-]?\d+)?$. It said Test 39/93: Multiple dots or commas must not be allowed.

Aren't these two hints contradictory?

Question 2

When I tried another one ^(?:[+-]?\d+(?:[.,]\d*(?:e\d+)?)?|[.,]\d*e?\d+)$, it kept prompting Test 45/93: A leading dot or comma must be allowed. However, all my local tests passed(see below). Can you tell me one of your failed test cases? Thank you.

45
3.14159
3,14159
334,399
23.14159
23,14159
3979.141e59
3.e2
3,e2
.11
,11
.e2
,e2
.2e2
,2e2
-1.35
-2.e2

[Startrekzky]

Bump

[firasdib]

How so? You must allow a trailing dot, but not multiple.