Example request for using Regex in Keda for Azure service bus

[SusheelReddy00]

I am trying to use Regular expression to select all subscriptions under a specific topic. I can see from your docs that is is possible using "Regex": "true". The reason is to avoid creating multiple scaledobjects which ends up creating multiple HPA's for the same service and causing conflicts.

Below is the example I am trying however I get an error like the one given below. I made sure that it works and no problem exists with my authentication when not using Regex and passing a subscription name.

apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
  annotations:
    meta.helm.sh/release-name: customer-risk-service
    meta.helm.sh/release-namespace: service
  labels:
    app.kubernetes.io/managed-by: Helm
    scaledobject.keda.sh/name: customer-risk-service-risk-received
    servicename: customer-risk
  name: customer-risk-service-risk-received
  namespace: service
spec:
  cooldownPeriod: 300
  fallback:
    failureThreshold: 3
    replicas: 6
  maxReplicaCount: 100
  minReplicaCount: 1
  pollingInterval: 30
  scaleTargetRef:
    name: customer-risk-service-deployment
  triggers:
    - authenticationRef:
        name: trigger-auth-service-bus
      metadata:
        messageCount: '100'
        namespace: dev-test-bus
        subscriptionName: ^*Processor$
        useRegex: "true"
        topicName: risk.countries.received
      type: azure-servicebus

Error I am getting

2023-01-18T11:11:03-06:00 2023-01-18T17:11:03Z	ERROR	scalehandler	Error getting scale decision	{"scaledobject.Name": "customer-risk-service-risk-received", "scaledObject.Namespace": "service", "scaleTarget.Name": "customer-risk-service-deployment", "error": "request failed: 401 SubCode=40104: Invalid authorization token audience"}
2023-01-18T11:11:03-06:00 github.com/kedacore/keda/v2/pkg/scaling.(*scaleHandler).checkScalers
2023-01-18T11:11:03-06:00 	/workspace/pkg/scaling/scale_handler.go:278
2023-01-18T11:11:03-06:00 github.com/kedacore/keda/v2/pkg/scaling.(*scaleHandler).startScaleLoop
2023-01-18T11:11:03-06:00 	/workspace/pkg/scaling/scale_handler.go:149
2023-01-18T11:11:04-06:00 2023-01-18T17:11:04Z	INFO	scaleexecutor	Successfully set ScaleTarget replicas count to ScaledObject fallback.replicas	{"scaledobject.Name": "customer-risk-service-risk-received", "scaledObject.Namespace": "service", "scaleTarget.Name": "customer-risk-service-deployment", "Original Replicas Count": 6, "New Replicas Count"

I would like to see an example where I can define a regular expression that covers all the subscriptions under a topic