#!/usr/bin/perl
use strict;
use warnings;
use Regexp::Common qw /net/;


$/ = "";

while (<DATA>){
        next if /\A vfiler0 /x;
        /$RE{net}{IPv4}{-keep}/ and print $1, "\n";
}

__DATA__
vfiler0                          running
    ipspace: default-ipspace
    IP address: 10.42.156.16 [e0a]
    IP address: 10.42.156.19 [bae_test]
    IP address: 10.42.156.18 [e5a]
    Path: / [/etc]
    UUID: 00000000-0000-0000-0000-000000000000

 vfiler1                          running
    ipspace: default-ipspace
    IP address: 123.123.123.123 [unconfigured]
    Path: /vol/palermo [/etc]
    UUID: 4fa0d3d8-ecd6-11df-af94-00a09808463c

 vfilerbae                        running
    ipspace: default-ipspace
    IP address: 123.124.123.123 [unconfigured]
    Path: /vol/bae_testing [/etc]
    UUID: 605f7aa8-ecd6-11df-af94-00a09808463c