Unable to use with Rails helpers

[codepilotsf]

I'm trying to get Headwind working with Rails helpers which look like this:
<%= some_helper, class: "text-blue-500 font-bold" %>

I've read the docs and tried adding this to my settings.json:

"headwind.classRegex": {
    "erb": "\\bclass\\s*:\\s*[\\\"\\']([\\._a-zA-Z0-9\\s\\-\\:\\/]+)[\\\"\\']",
    "html": "\\bclass\\s*:\\s*[\\\"\\']([\\._a-zA-Z0-9\\s\\-\\:\\/]+)[\\\"\\']",
  },

...but nothing seems to work. Not entirely sure this is a bug but perhaps it reveals a documentation shortcoming? Any tips would be greatly appreciated. Note that Headwind works great with regular HTML tags <p class="...">.