What is the rule of proxy path? Can I write regular expression?

Ionic Framework ionic-v3
1

Good afternoon,

What is the rule of proxy path?

Can I write Regular expression?

My proxy path is below

  "proxies": [
    {
      "path": "/*",
      "proxyUrl": "http://localhost:8100/"
    }
  ]

with path: “/" all the access goes to index.html even ".js” files goes to index.html.

so the browser cannot load *.js files.

How can I route all access except .js files.