use strict;
my $str = '255.0.0.1
127.0.0.1
127,0,0,1
192.168.178.90
89.50.50.123
0000.2.2.2
2.0000.2.2
2.2.0000.2
2.2.2.0000';
my $regex = qr/(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-5][0-5])/p;
if ( $str =~ /$regex/ ) {
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