These pass as valid IP addresses:
10. 22. 109 934324 23832 23.104
200. 12.21.3
0.^^&7".34.55-1
Try this:
while ( <DATA> ) {
chomp;
print $_, ": ", check_ip( $_ ), "\n";
}
sub check_ip {
my ( $ip ) = @_;
return "Wrong format" unless $ip =~ /^(\d{1,3}\.){3}\d{1,3}$/;
return "Illegal value" if grep { $_ > 255 } split /\./, $ip;
return "Weird zeroes" if grep { /^0[0-9]/ } split /\./, $ip;
return "OK"
}
__DATA__
0.^^&7".34.55-1
fda.er32.223.1
10.00.120.13
32.294.233.12
-02.35.54.54
41.41.22.50
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