`

- name: read network
  hosts: localhost
  vars:
    CUSTOMER: "{{ CUST | default("me") }}"
    list: " {{ lookup('file', 'networks').split('n')[0] }} "
    gway: " {{ list.split(' ')[2] }} "
    netw: " {{ list.split(' ')[1] }} "
  tasks:
    - name: test1
      lineinfile:
        path: 'networks'
        state: absent
      **  regexp: "{{netw}}"**
    - debug:
        var: gway
    - debug:
        var: netw

The variable netw printed in output correct: my networks file has networks and gateways example:
172.16.25.0/29 172.16.25.1

but not delete the line from file.
if i write this hard coded it’s working: regexp: “172.16.25.1”