In Ansible, how to use a variable inside a variable definition that uses filters

问题

I want to extract a few regex matches out of a URL. The only way I could do this was following:

  - name: Set regex pattern for github URL
    set_fact: pattern="^(git\@github\.com\:|https?\:\/\/github.com\/)(.*)\/([^\.]+)(\.git)?$"

  - name: Extract organization name
    set_fact: project_repo="{{ deploy_fork | regex_replace( "^(git\@github\.com\:|https?\:\/\/github.com\/)(.*)\/([^\.]+)(\.git)?$", "\\3" ) }}"
    when: deploy_fork | match( "{{ pattern }}" )

With this approach, I'm able to reuse the variable pattern in the match filter, but not on the set_fact line where I assign the extracted text to another variable. Is there any way to reuse the variable in set_fact that uses filter(s) ?

回答1:

You should just be able to reference the defined variables directly. Try this; it worked for me:

- name: Set regex pattern for github URL
  set_fact: pattern="^(git\@github\.com\:|https?\:\/\/github.com\/)(.*)\/([^\.]+)(\.git)?$"
- name: Extract organization name
  set_fact: project_repo="{{ deploy_fork | regex_replace(pattern, "\\3" ) }}"
  when: deploy_fork | match(pattern)

回答2:

You don’t need to use {{ }} to use variables inside conditionals, as these are already implied.

You can find detailed descriptions here Ansible Conditionals

来源：https://stackoverflow.com/questions/33112403/in-ansible-how-to-use-a-variable-inside-a-variable-definition-that-uses-filters