Ansible: get IP address of host by regular-expression

filter_plugins__match_ip.py

# file: filter_plugins/match_ip.py

from ansible import errors
import re

def match_ip(ips, pattern):
    if type(ips) != list:
        raise errors.AnsibleFilterError("|failed expects a list")

    for ip in ips:
        if re.match(pattern, ip):
            return ip

    return ''

class FilterModule (object):
    def filters(self):
        return {"match_ip": match_ip}

match_ip.yml

---
- hosts: default

  tasks:
    - name: Get IP
      debug: "msg={{ ansible_all_ipv4_addresses|match_ip('^192.168.1.') }}"