Promtail configuration for haproxy logs

I am sending logs to loki using promtail . For Haproxy logs i need to parse and fetch labels such as Status code, Client Ip etc. I am using this configuration for promtail but it is not working

  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://192.168.78.81:3100/loki/api/v1/push

scrape_configs:
- job_name: system
  static_configs:
  - targets:
      - localhost
    labels:
      job: haproxy
      __path__: /var/log/haproxy/haproxy.log
  pipeline_stages:
  - match:
      - selector: '{job="haproxy"}'
        stages:
        - regex:
            expression: '^(?<c_ip>[\w\.]+):(?<c_port>\d+) \[(?<time>.+)\] (?<f_end>[\w\~\-]+) (?<b_end>[\w-]+)\/(?<b_server>[<>\w\.-]+) (?<tq>[\d\-]+)\/(?<tw>[\d\-]+)\/(?<tc>[\d\-]+)\/(?<tr>[\d\-]+)\/(?<tt>[\d\-]+) (?<status_code>\d+) (?<bytes>\d+) (?<req_cookie>\S?) 
(?<res_cookie>\S?) (?<t_state>[\w\-]+) (?<actconn>\d+)\/(?<feconn>\d+)\/(?<beconn>\d+)\/(?<srv_conn>\d+)\/(?<retries>\d+) (?<srv_queue>\d+)\/(?<backend_queue>\d+) \{?(?<req_headers>[^}"]*)\}? ?"(?<request>[^"]*)"'
        - labels:
            c_ip:

Log Examples

192.168.25.38:57356 [04/Aug/2021:07:23:26.480] http_front artifact_backend/artifact01 0/0/0/2/2 404 232 - - ---- 13/13/0/0/0 0/0 {Artifactory/6.1.0} "HEAD /artifactory/all-repos/com/xyz/log-processor/1.0.0-SNAPSHOT/maven-metadata.xml HTTP/1.1"

192.168.25.38:60428 [04/Aug/2021:07:23:25.187] http_front ci_cluster/ci01 0/0/1/1/2 403 915 - - ---- 13/13/0/0/0 0/0 {Go-http-client/1.1} "GET / HTTP/1.1"

Kindly help me to solve this by fixing it and creating the right config.