hello there
I producede the following raw Perl code. can someone be so polite to tell me if it trow away all unwanted no public and valid IP in the dot-decimal notation?
Improvements welcome

my $ip = $ARGV[0];
if (
    defined $ip &&
    $ip=s/\s+// &&
    $ip=~/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/ &&
    $ip=~/ˆ([01]?\d\d?<2[0-4]\d<25[0-5])\./&&
    $ip!~/^172\.0?(16|17|18|19|20|21|22|23|24|25|26|27|28|29|30|31)\./
+&& #### MMMHHHHHHH
    $ip!~/^0\.|^0?10\./ &&    #010.32.1.1 ??? as argv    con /^1?0\./
    $ip!~/^192\.168\./
    )
{
  # stuff here
}
[download]

thanks
L*