NAPI: How to match a JS regex from a C++ thread? - c++

Question

I am modifying a Node native extension that is spawning native threads to do some processing. My issue is that I'd like to have the Javascript code provide a filter for the processing to exclude some data.
At this point, I'm passing a JS RegExp string from JS to C++, creating a std::regex instance from it, and passing it around the different structures down to the native thread logic.
My issue now is that despite std::regex using what seems to be the same syntax as ECMAScript regular expressions, the behavior is not the same :(
My original plan was to rely on V8's RegExp engine somehow but trigger the C++ bits directly instead of going from C++ to JS and back. But I wasn't able to find how to do this.
As example, see the following programs using the same regex but yielding different results:
#include <stdio.h>
#include <regex>
int main() {
std::regex re("^(?:(?:(?!(?:\\/|^)\\.).)*?\\/c)$");
std::smatch match;
std::string input("a.b/c");
int result = std::regex_match(input, match, re);
if (result == 1) {
printf("ok");
} else {
printf("nok");
}
return 0;
}
The equivalent JS code:
const re = new RegExp("^(?:(?:(?!(?:\\/|^)\\.).)*?\\/c)$");
const match = re.exec("a.b/c");
if (match) {
console.log("ok");
} else {
console.log("nok");
}
My question then is: What can I do to get the same results I would in JS but in C++? Is it possible to run V8's RegExp from a pure C++ context?