How to select collections that starts with a certain prefix using Firebase security rules wildcard

Question

I have two sets of collections in firebase. One set that starts with a prefix 'user'

For example

• /user_invoice
• /user_report

... etc

and the other set that does not start with any particular prefix.something like

• config
• customer

..etc

Is there a way that I can apply a set of security rules using wildcard or any other means for all the collections that starts with 'user_' and another set of rules for other set of collections

Answer 1

You can select specific collections that starts with user_ like this:

service cloud.firestore {
  match /databases/{database}/documents {
    match /{collection=user_**}/{doc} {
      // Rules for collections that does start with user_
    }
    match /{collection=!(user_**)/{doc} {
      // Rules for collections that doesn't start with user_
      
    }
  }
}

You can read more about control access to specific fields here. I hope it helps