The sub(s) will take parameters. One sub per module in the distribution. Here's the real code section of the new module. I've only added one module's sub so far:

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
);

my %brewbuild = (

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

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

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

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

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

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

    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})?)
    }x,
);

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

1;
[download]

You can probably use straight-up $str =~ re() syntax with global searches as well, just make sure the re() returns a :lvalue. Either that or return a ref: $str =~ ${re()}.

I don't see any connexion between :lvalue and /g. $str =~ ${re()} isn't a global search but the output of qr is already a reference so /${re()}/g works, as pointed out by salva.

Embarrasing. I read it exactly backwards. Something like while (str() =~ /(.)/g) can be made to work by using sub str :lvalue { state $x = "abcd" }.

Sorry about the noise.