javascript – Regex to match character unless it is preceded by an odd number of another specific character

Another way to state my problem is to match a character always when it is preceded by an even number (0, 2, 4, …) of another specific character.

In my case I want to match all ' characters in string unless it is preceded by an odd number (1, 3, 5 …) of ?

example:

- ?' => shouldn't match (preceded by one ?)
- ??' => Should match (preceded by 2 ?)
- ?????' => Shouldn't match (preceded by 5 ?)

Lets consider this scenario:

We have this string : ' ??' ????' ?' ??????' then the regex should match all ' characters in this case except for the 4th one, so for example if I want to use String.split(regex) the result would be [”, ‘??’, ‘????’, ?’ ‘??????’]

Currently I was using this regex: (?, but the problem is that it matches only if there is no ? before '