Ansible 2.5.5 - before attribute in 'replace' module not working

Question

I'm trying to replace only the first occurrence after a specific string. However, ansible would always match all occurrences. Here's the file:

Here's my ansible task:

    - name: Update minPoolSize for CWTxDataSource dataSource
      replace:
        dest: "{{ op_db_path }}"
        after: ".*CWTxDataSourceXA"
        regexp: "^.*minPoolSize=.*$"
        replace: '        <connectionManager maxPoolSize="750" minPoolSize="20" />'
        backup: yes

    <dataSource jndiName="CWTxDataSource">
        <connectionManager maxPoolSize="750" minPoolSize="1" />
    </dataSource>

    <dataSource jndiName="UMDataSource">
        <connectionManager maxPoolSize="750" minPoolSize="1" />
    </dataSource>

in the above sample both connectionManager tags would get updated which is not the desired behavior? How can I update my regexp to only update first match?? I tried the before option in replace module as a workaround but that didn't work for me for some reason.

Answer 1

I found the following line in ansible docs:

# Prior to Ansible 2.7.10, using before and after in combination did the opposite of what was intended.

so in order for me to use after before as a workaround I had to reverse their values:

    - name: Update minPoolSize for CWTxDataSource dataSource
      # after / before values are reversed in ansible < 2.7
      replace:
        path: "{{ op_db_path }}"
        before: 'jndiName="CWTxDataSource"'
        after: "</dataSource>"
        regexp: 'minPoolSize="\d+"'
        replace: 'minPoolSize="{{ CWTxDS_minPoolSize }}"'

notice the after before values don't really make sense but it works!