I have a requirement where I have to extract/filter particular length of a string in ansible. For example:-
My node machine has following hostname:- jpujenkins, jpunessus.
So in fact variable we will have.
{{ ansible_hostname }} --> jpujenkins.
{{ ansible_hostname }} --> jpunessus
But I want to remove first three letter say 'jpu' from the all node hostname.
Desired output :- jenkins, nessus
Also can be capitalize the letter say JENKINS, NESSUS?
You could use regex_replace Ansible filter to fulfill your need.
https://docs.ansible.com/ansible/latest/user_guide/playbooks_filters.html#regular-expression-filters
For example, my hostname is ip-192-168-1-65.
---
- hosts: all
tasks:
- debug: msg="{{ ansible_hostname | regex_replace('^ip-', '') }}"
When I execute the playbook it returns the hostname where '^ip-' part is replaced with an empty string ''.
TASK [debug] *********************************************************************************************************************************************************************
Tuesday 28 April 2020 11:18:24 +0300 (0:00:07.281) 0:00:07.498 *********
ok: [localhost] =>
msg: 192-168-1-65
