:) same here

It might depend on the regular expression engine, but I'd imagine a fixed-width look-around can be optimized to some extent; and I think I've run into it where engines don't support variable-width look-around. Only engine I've really looked at code for is Python's and all the goto statements in there make it pretty hard to follow. What I learned there is that you can avoid regular expression DOS with system interrupts using Python's regular expression engine.

Bruh , I can't understand anything.

There's always a cleaver one.

You sir are genius

Try it and you will see.

Bruh

Does this whole code actually work??

There's always a cleaver one and this is it.

What the flying f is this.

-0 is a (computing) convention, as such it is not less a number than 0 (it's just two ways of representing the mathematic 0 in different contexts). But it is not a problem here since in JS 0 === -0, so this difference won't make an answer invalid.

Okay , what I understand is -0 is not a number maybe it is? I'm not good at math tho.

Which is not a problem.