Regular expression ending in ? breaks highlighting

[mjbvz]

From microsoft/vscode#90184

TS and JS Grammar Extension version: 0.0.53 / latest

Code

const x = !/s?/;
let foo;

After the regular expression, the highlighting is off:

[zajrik]

I believe this is the similar to my issue (#806), in that it's actually fine if you remove the !:

[sheetalkamat]

Yep fixed by d63aae4