#!/usr/bin/perl
use strict;
use warnings;
use Benchmark qw(:all);
use Regexp::MatchContext;

my $count   = 300000;
# to test that all solutions produce the same output
my $VERBOSE = 0;
$count = 2 if $VERBOSE;

my $seq
    = 'GGGTTGAAGTTTAGACCGCTCACAGTAGTTCTACCTATAGAAAAGATCATGAAAGAGGCGATCAGAATGGTACTCGAATCCATTTACGATCCCGAGTTTCCAGACACATCGCATTTCCGCTCGGGTCAAGGCTGCCACTCGGTCCTAAGACGGATCAAAGAAGAGTGGGGAATCTCTCGCTGGTTTTTAGAATTCGACATCAGGAAGTGTTTTCACACCATCGACCGACATCGACTCATCCAAATTTTGAAGGAAGAGATCGACGATCCCAAGTTCTTTTACTCCATTCAGAAAGTATTTTCCGCCGGACGACTCGTAGGAGTTGAGAGGGGCCCTTACTCCGTCCCACACAGTGTACTACTATCGGCCCTACCAGGCAACATCTACCTACACAAGCTCGATCAGGAGATAGGGAGGATCCGACAGAAGTACGAAATTCCGATTGTTCAGAGAGTCAGATCGGTTCTATTAAGGACAGGTCGTCGTATTGATGACCAAGAAAACCCTGGAGAAGAAGCAAGCTTCAACGCTCCCCAAGACAACAGAGCCATCATTGTGGGGAGCGTTAAGAGCATGCAACGCAAAGCGGCCTTTCATTCCCTTGTTTCGTCGTGGCACACCCCCCCCACAAGCACCCTCCGGCTCAGGGGGGACCAGAAAAGGCCTTTCGTTTTCCCCCCTTCGTCGGCCCTTGCCGTCTTCCTTAACAAGCCCTCGAGCCTTCTTTGCGCCGCCTTCCTCATAGAAGCCGCCGGGTTGACCCCGAAGGCTGAATTCTATGGTGGAGAACGCTGTAATAATAATTGGGCCATGAGAGACCTTCTTAAGTATTGCAAAAGAAAGGGCCTGCTGATAGAGCTGGGCGGGGAGGCGATACTAGTTATCAGGTCAGAGAGAGGCCTGGCCCGTAAGCAGGCCCCCTTAAAAACCCATTACTTAATAAGGATTTGTTACGCGCGATATGCCGACGACTTACTACTGGGAATCGTGGGTGCCGTAGAGCTTCTCATAGAAATACAAAAACGTATCGCCCATTTCCTACAATCTGGCCTGAACCTTTGGGTAGGCTCCGCAGGATCAACAACAATAGCTGCACGGAGTACGGTAGAATTCCTTGGTACGGTCATTCGGGAAGTCCCTCCGAGGACGACTCCCATACAATTTTTGCGAGAGCTGGAAAAGCGTCTACGGGTAAAGCACCGTATCCATATAACTGCTTGCCACCTACGCTCCGCCATCCATTCAAAGTTTAGGAACCTAGGTGATAGTATCCCGATCAAACAGCTGACGAAGGGGATGAGCAAAACAGGGAGTCTACAGGACGGGGTTCAACTAGCGGAGACTCTTGGAACAGCTGGAGTCAGAAGTCCCCAAGTTAGCGTATTATGGGGGACCGTCAAGCACATCCGGCAAGGATCAAGGGGGATCTCGTTCTTGCATAGCTCAGGTCGGAGCAACGCGTCATCGGACGTTCAACAGGTAGTCTCACGATCGGGCACTCATGCCCGTAAGTTGTCATTGTATACTCCCCCGGGTCGGAAGGCGGCGGGGGAGGGAGGAGGACACTGGGCGGGATCTATCAGCAGCGAATTCCCCATAAAGATAGAGGCACCTATAAAAAAGATACTCCGAAGGCTTCGGGATCGAGGTATCATTAGCCGAAGAAGACCCTGGCCAATCCACGTGGCCTGTTTGACGAACGTCAGCGACGAAGACATCGTAAATTGGTCCGCGGGCATCGCGATAAGTCCTCTGTCCTACTACAGGTGCCGCGACAACCTTTATCAAGTCCGAACGATTGTCGACCACCAGATTCGCTGGTCTGCAATATTCACCCTAGCCCACAAGCACAAATCCTCGGCGCCGAATATAATCCTCAAGTACTCCAAAGACTCAAATATTGTAAATCAAGAAGGTGGCAAGATCCTTGCAGAGTTCCCCAACAGCATAGAGCTTGGGAAGCTCGGACCCGGTCAAGACCTGAACAAGAAGGAACACTCAACTACTAGTCTAGTCTAG';

cmpthese(
    $count,
    {   'regex' => sub {
            my ( $prematch, $match, $postmatch )
                = $seq =~ m{(\A .*?) (CTGGCCCGTAA) (.*\z) }xms;
            warn "$prematch   $match   $postmatch" if $VERBOSE;
        },
        'matchvars' => sub {
            $seq =~ m{CTGGCCCGTAA}xms;
            my ($prematch, $match, $postmatch) = ($`, $&, $');
            warn "$prematch   $match   $postmatch" if $VERBOSE;
        },
        'context' => sub {
            $seq =~ m{(?p)CTGGCCCGTAA}xms;
            my ( $prematch, $match, $postmatch )
                = ( PREMATCH(), MATCH(), POSTMATCH() );
            warn "$prematch   $match   $postmatch" if $VERBOSE;
        },
        'at_minus' => sub {
            $seq =~ m{CTGGCCCGTAA}xms;
            my $prematch = substr( $seq, 0, $-[0] );
            my $match = substr( $seq, $-[$#-], $+[$#-] - $-[$#-] );
            my $postmatch = substr( $seq, $+[$#+] );
            warn "$prematch   $match   $postmatch" if $VERBOSE;
        },
    }
);