This is a great idea! I'll have a good look at Regexp::Common over the weekend. I did get a full implementation and all my tests are passing on both Unix and Windows, so I did get it to work correctly. I've moved on to updating berrybrew with some new enhancements/bug fixes before I can get back to that distribution, as it relies on some berrybrew changes anyway.

I'll create a new branch and test it out, but at this time, this is what I ended up with:

package Test::BrewBuild::Regex;
use strict;
use warnings;

use Carp qw(croak);
use Exporter qw(import);

our $VERSION = '2.20';

our @EXPORT = qw(
    re_brewbuild
    re_brewcommands
    re_dispatch
    re_git
);

my %brewbuild = (

    check_failed => qr{failed.*?See\s+(.*?)\s+for details},

    check_result => qr{
        [Pp]erl-\d\.\d+\.\d+(?:_\w+)?
        \s+===.*?
        (?=(?:[Pp]erl-\d\.\d+\.\d+(?:_\w+)?\s+===|$))
    }xs,

    extract_dzil_dist_name => qr{^name\s+=\s+(.*)$},

    extract_dzil_dist_version => qr{^version\s+=\s+(.*)$},

    extract_errors => qr{
        cpanm\s+\(App::cpanminus\)
        .*?
        (?=(?:cpanm\s+\(App::cpanminus\)|$))
    }xs,

    extract_error_perl_ver => qr{cpanm.*?perl\s(5\.\d+)\s},

    extract_result => qr{
        ([Pp]erl-\d\.\d+\.\d+(?:_\w+)?\s+=+?)
        (\s+.*?)
        (?=(?:[Pp]erl-\d\.\d+\.\d+(?:_\w+)?\s+===|$))
    }xs,

    extract_perl_version => qr{^([Pp]erl-\d\.\d+\.\d+(_\d{2})?)},
);

my %brewcommands = (

    available_berrybrew => qr{(\d\.\d+\.\d+_\d+)},

    available_perlbrew => qr{(?<!c)(perl-\d\.\d+\.\d+(?:-RC\d+)?)},

    installed_berrybrew => qr{(\d\.\d{2}\.\d(?:_\d{2}))(?!=_)\s+\[inst
+alled\]}i,

    installed_perlbrew => qr{i\s+(perl-\d\.\d+\.\d+)},

    using_berrybrew => qr{(\d\.\d{2}\.\d(?:_\d{2}))(?!=_)\s+\[installe
+d\]\s+\*}i,
);

my %dispatch = (

    extract_short_results => qr{(5\.\d{1,2}\.\d{1,2} :: \w{4})},
);

my %git = (

    extract_repo_name => qr{.*/(.*?)(?:\.git)*$},

    extract_commit_csum => qr{([A-F0-9]{40})\s+HEAD}i,
);

sub re_brewbuild {
    my $re = shift;
    _check(\%brewbuild, $re);
    return $brewbuild{$re};
}
sub re_brewcommands {
    my $re = shift;
    _check(\%brewcommands, $re);
    return $brewcommands{$re};
}
sub re_dispatch {
    my $re = shift;
    _check(\%dispatch, $re);
    return $dispatch{$re};
}
sub re_git {
    my $re = shift;
    _check(\%git, $re);
    return $git{$re};
}
sub _check {
    my ($module, $re) = @_;
    croak "regex '$re' doesn't exist for re_${module}()"
      if ! exists $module->{$re};
}

1;
[download]

(POD redacted).

Thanks for all of the tips and advice everyone!