Enable Autocompletion for tailwind classes in the extensions config

[JaleXHolguin]

I've created a regex that can be used to enable autocompletion for tailwind classes in the extensions config. This regex captures the class or imageClass key in objects, allowing for better autocomplete suggestions. It works with classes wrapped in single quotes, double quotes, or backticks.

{
  "tailwindCSS.experimental.classRegex": [
    "(?:class|imageClass)\\s*:\\s*(?:[\"'`])(.*?)(?:[\"'`])"
  ],
}