Hello, can I please ask for advice here - when I write my return string to the buffer 'result' like you said it just seems to contain the previous return string from the tests that were run before, so it basically fails right at the second test string.

This is not how re.match() function works. See official docs.

Python test case is broken, bool(re.Match) is always True

(Python) I've written a regex that returns a match object with length 0, but bool(match) is still True. What now?

you deleted the const qualifier of the first string parameter... do not do that. the strtok() function modifies its input, you need to make a copy of the string before calling strtok() on it

You need to write your answer to the buffer pointed by result.

Hi! How should I return the value in C?