use strict;
my $str = 'This is not a case. But this is: Riley v. California. And riley v. california also isn\'t.
Riley v. California and Mapp v. Ohio "United Zinc & Chemical Co. v. Britt" should all count, but not MAPP V. OHIO!
Both R.A. Peacock v. Lubbock Compress Company and Battalla v. State of New York have complex names.
But also, Craggan v. IKEA USA and this Case: Edwards v. Honeywell, Inc..';
my $regex = qr/((\b\p{Upper}\w+)|(\b\p{Upper}\w{1,5}\.)) ?( ((\b\p{Lower}{1,6})|(\b\p{Upper}\w+)|((\b\p{Upper}\w{1,5}\.)))){0,4} v\.? ((\b\p{Upper}\w+)|(\b\p{Upper}\w{1,5}\.)) ?( ((\b\p{Lower}{1,6})|(\b\p{Upper}\w+)|((\b\p{Upper}\w{1,5}\.)))){0,4}/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