Welcome to the RingCentral Community

Check out the search syntax from here. We don't support all operators though.

Here is an example to search by email address:

async function search_user() {
    var params = {
          //filter: 'userName co "john.smith@live.com"'
          //filter: 'phoneNumbers [type eq "work" and value eq "12341234567"
          filter: 'emails [type eq "work" and value eq "firstname.lastname@gmail.com"]'
    }
    try {
      var resp = await platform.get('https://platform.ringcentral.com/scim/v2/Users', param
      var jsonObj = await resp.json()
      for (var res of jsonObj.Resources)
        console.log(res)
    }catch(e){
        console.log(e)
    }
}