#!/usr/bin/perl -w
use strict;

my $grp = qr/\[\d+-\d+\]/;

for (<DATA>) {
    print if /\d+\.\d+\.$grp\.(\d+|$grp)/;
}


__DATA__
123.145.[146-149].2
135.168.[10-115].[0-125]
135.168.12.[0-125]