How to add a string in end of line Ansible

Is this what you are looking for? “Append to existing line” section ==> Bootstrap

Append to an existing line

Let's say foo.txt contains "Hello World". Here is how you would append "example" after Hello World.

- lineinfile:
    path: /tmp/foo.txt
    backrefs: true
    regexp: '^(old line)$'
    line: '\1 example'
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