Replace a line in a config file using variables with ansible - deployment

Question

Question is similar to this one: Replace a line in a config file with ansible . Difference is that my playbook is first copying a file to a destination and then editing that same file after it's been copied. Also I'm using variables to replace the string, however it isn't changing the lines that contain the particular string site_name in the conf file.
Playbook;
---
- hosts: server-test2
become: true
vars:
site_name: bokucasinon.com
tasks:
- name: Configuring nginx for the new site
template:
src: ../provision-server/nginx.j2
dest: /etc/nginx/conf.d/{{site_name}}.conf
mode: 064
- name: Configuring nginx for the new site
become: true
lineinfile:
dest: /etc/nginx/conf.d/{{site_name}}.conf
regexp: '^(.*)site_name(.*)$'
line: "{{site_name}}"
backrefs: yes
Output:
TASK [Configuring nginx for the new site] **************************************************************
task path: /home/melvmagr/repos/ansible/provision-server/wp-db-nginx-conf.yml:10
ok: [server-test2] => {"changed": false, "checksum": "904d19dde94ad38672d751246fd2680ce297244d", "dest": "/etc/nginx/conf.d/bokucasinon.com.conf", "gid": 0, "group": "root", "mode": "0064", "owner": "root", "path": "/etc/nginx/conf.d/bokucasinon.com.conf", "size": 4232, "state": "file", "uid": 0}
TASK [Configuringg nginx for the new site] *************************************************************
task path: /home/melvmagr/repos/ansible/provision-server/wp-db-nginx-conf.yml:15
ok: [server-test2] => {"backup": "", "changed": false, "msg": ""}
META: ran handlers
META: ran handlers
PLAY RECAP *********************************************************************************************
server-test2 : ok=3 changed=0 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
As one can see, changed=0 and upon checking the conf file it remains site_name instead of bokucasinon.com
Another thing I tried was to use the replace module but got same output.
replace:
path: /etc/nginx/conf.d/{{site_name}}.conf
regexp: '(^site_name)(.*)$'
replace: '{{site_name}}'
Any ideas why this is happening or what I'm doing wrong?
Thanks in advance

Answer 1

Appreciate all of you for the help but I've managed to find what I was looking for, after lots of trials and errors. I did indeed need to use the ansible.builtin.replace module. Apparently what I was using (the lineinfile module) was not made for changing ALL the lines that contain a particular string (reference: https://www.middlewareinventory.com/blog/ansible-lineinfile-examples/) so basically just to put things into perspective, I needed to change my playbook with the following;
- name: Configuring nginx for the new site
become: true
template:
src: ../provision-server/nginx.j2
dest: /etc/nginx/conf.d/{{site_name}}.conf
mode: 064
- name: Configuring nginx for the new site
become: yes
become_user: root
ansible.builtin.replace:
path: /etc/nginx/conf.d/{{site_name}}.conf
regexp: 'sitename.com'
replace: "{{site_name}}"