invalid pattern for given tag tail + Kubernetes about fluent-bit HOT 2 OPEN

[PARSER]
    Name    kube-tag
    Format  regex
    Regex   ^(?<namespace_name>[^_]+)\.(?<pod_name>[a-z0-9](?:[-a-z0-9]*[a-z0-9])?(?:\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*)\.(?<container_name>.+)

[INPUT]
    Name              tail
    Tag               kube.<namespace_name>.<pod_name>.<container_name>
    Path              /var/log/containers/*.log
    Tag_Regex         (?<pod_name>[a-z0-9](?:[-a-z0-9]*[a-z0-9])?(?:\\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*)_(?<namespace_name>[^_]+)_(?<container_name>.+)-[a-z0-9]{64}\.log$
    Parser            cri
    DB                /var/log/containers/fluentbit_kube.db
    Mem_Buf_Limit     10MB
    Skip_Long_Lines   Off
    Refresh_Interval  10

[FILTER]
    Name                kubernetes
    Match               kube.*
    Kube_URL            https://kubernetes.default.svc:443
    Kube_CA_File        /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
    Kube_Token_File     /var/run/secrets/kubernetes.io/serviceaccount/token
    Kube_Tag_Prefix     kube.
    Regex_Parser        kube-tag
    Merge_Log           On
    Merge_Log_Trim      On
    Keep_Log            Off
    K8S-Logging.Parser  On
    K8S-Logging.Exclude Off
    Annotations         Off
    Labels              On

[OUTPUT]
    name    stdout
    match   kube.ns1.*
    Format  json