If you only want to match these IP's in the specified range you could use something like this:
my $regex = qr/(123\.145\.14[6-9]\.2)|(135\.168\.[1-9][0-9][0-5]?\.[0-
+9][0-2]?[0-5]?)/o;
print "$ip matched\n" if $ip =~ /$regex/;

[download]
Regards
Dietz

Update:
Added code below (see Re^4: IP Filtering RegEx needed)

In reply to Re: IP Filtering RegEx needed by Dietz
in thread IP Filtering RegEx needed by Anonymous Monk

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