Color highlight of JS gets confused after regex

[neiljvr1]

Issue Type: Bug

create .js file with this content:

var myWindowsDriveLabel = "D:\\";
console.log("This is colour coded");
if (!/^[d-zD-Z]\:\\?$/.test(myWindowsDriveLabel)) {
  console.log("This is NOT colour coded anymore");
} 

VS Code version: Code 1.42.1 (c47d83b, 2020-02-11T14:45:59.656Z)
OS version: Windows_NT x64 10.0.17763

[mjbvz]

Duplicate of microsoft/TypeScript-TmLanguage#806