JSDoc property name is not parsed as expected when non-alphanumeric characters are present and intellisense not showing properties

*TS Template added by @mjbvz* **TypeScript Version**: 3.8.0-dev.20200104 **Search terms**: - jsdoc / jsdocs - completionInfo --- <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Also please test using the latest insiders build to make sure your issue has not already been fixed: https://code.visualstudio.com/insiders/ --> <!-- Use Help > Report Issue to prefill these. --> - VSCode Version: 1.41.1 (user setup) - OS Version: Windows_NT x64 10.0.17134 **Origin of this discovery:** I was trying to document my types which translate to XML classes. The syntax for which includes the "@class" as a property name of my object. This is not possible given the current syntax parsing in VSCode. **Steps to Reproduce:** 1. Place this code in the editor with the language as Javascript Code: ```javascript /** * @typedef Foo * @property {string} bar Property shows in intellisense * @property {string} @baz Property should show in intellisense but does not * @property {string} test Property should show in intellisense but does not * @property {string} @class Property name "@class" should be a possible property name that * does not get interpreted as a JSDoc instruction. * @property {string} even#ThisShouldBeAValidName! But the name is not parsed as expeted */ /** * @type {Foo} */ const fooInstance = { } ``` 2. Prompt the intellisense to show within the "fooInstance" object. 1. Expected: The properties @ baz and @ class should be highlighted like normal property names 1. Actual: The properties are shown as if they were JSDoc instructions 2. Expected: The property "even#ThisShouldBeAValidName!" should be highlighted like a normal property name 1. Actual: The property is highlighted as expected until the "#" symbol and then it seems to be treated like a comment 3. Expected: Intellisense should show all the properties 1. Actual: Only the f…