[Bug] C++ Raw strings aren't properly handled when the delimiter contains a quote

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Code

monaco.editor.create(document.getElementById('container'), {
	value: `
int main() {
    auto _ = R""( content )"";
}`,
	language: 'cpp'
});

Reproduction Steps

paste the code in the js section and observe the resulting highlight being wrong

Actual (Problematic) Behavior

The raw string end isn't properly detected and the string highlighting continues until the end of the file

Expected Behavior

the raw string's end is properly detected

Additional Context

C++ raw string have the form R"delimiter(content)delimiter" where the delimiter is a (possibly empty) sequence of characters that may include quotes. when the delimiter contains quotes, the end isn't properly detected. having looked at the sources, while I don't understand everything, it looks a lot like this regex is responsible, as it exclude the quotes from the characters making up the delimiter (there's a mismatch with the regex for the opening delimiter):

raw: [
  [
    /(.*)(\))(?:([^ ()\\\t"]*))(\")/,