use strict;
my $str = 'Min val is 0. Leading zeros don\'t
match unless the value is 0.
0, 0, 0
00, 0, 0
0, 0, 00
Max numeric number is 255, anything
larger than 255 will not match.
255, 255, 255
255, 255, 256
4-Digit numbers will not match
1, 11, 111
11, 111, 1111
dangling commas do not match
45, 67, 89
45, 67, 89,
Obviously if a dangling comma doesn\'t
match, neither will 4 numbers.
1, 2, 3
1, 2, 3, 4
Two numbers do not match, and adding a space,
or space & comma, doesn\'t match either.
0, 1, 2
0, 1
0, 1,
0, 1,
Single numbers do not match; adding a space &/or
comma, will not cause the single number to match.
9, 9, 9
9
9,
9, ';
my $regex = qr/^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9]), (25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9]), (25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])$/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