use strict;
my $str = '182.74.25.170
1.1.1.1
8.8.8.8
129.1.1.1
110.10.10.10
10.0.0.0
100.64.0.0
127.0.0.0
169.254.0.0
172.16.0.0
192.0.0.0
192.0.2.0
192.88.99.0
192.168.0.0
198.18.0.0
198.51.100.0
203.0.113.0
224.0.0.0
240.0.0.0
255.255.255.255';
my $regex = qr/^(?!^0\.)(?!^10\.)(?!^100\.6[4-9]\.)(?!^100\.[7-9]\d\.)(?!^100\.1[0-1]\d\.)(?!^100\.12[0-7]\.)(?!^127\.)(?!^169\.254\.)(?!^172\.1[6-9]\.)(?!^172\.2[0-9]\.)(?!^172\.3[0-1]\.)(?!^192\.0\.0\.)(?!^192\.0\.2\.)(?!^192\.88\.99\.)(?!^192\.168\.)(?!^198\.1[8-9]\.)(?!^198\.51\.100\.)(?!^203.0\.113\.)(?!^22[4-9]\.)(?!^23[0-9]\.)(?!^24[0-9]\.)(?!^25[0-5]\.)(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))$
/mp;
if ( $str =~ /$regex/g ) {
print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n";
# print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n";
# print "Capture Group 2 is $2 ... and so on\n";
}
# ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p'
# Named capture groups can be called via $+{name}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html