Ansible help regex

[Numi]

Hello, I was wondering if someone can possible help me with my Ansible playbook. I have a file called myfile.yml with a line that contains an image. Example line:

service:
    blahblah
    image: myoldimagename
    blahblah

I want to change everything after the word "image: " with a configuration line, however I'm having trouble. For example, I want to replace "myoldimagename" with "mynewline". I don'e want to match "myoldimagename" explicitly because that may be different. 

    - name: Configure myfile.yml
      replace:
        path: /data/config/myfile.yml
        regexp: "(?<=image: ).*"
        replace: \1mynewline
        backup: yes

[Philippe Eveque]

see https://www.regular-expressions.info/lookaround.html  for explanations.

lookaround is not consuming any characters.

try on https://regex101.com/ to make it concrete about what is matched or not

HTH

Phil

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