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+# Wallet::ACL::Krb5::Regex -- Wallet Kerberos v5 principal regex ACL verifier
+#
+# Written by Russ Allbery <eagle@eyrie.org>
+# Copyright 2007, 2010, 2014
+#     The Board of Trustees of the Leland Stanford Junior University
+#
+# See LICENSE for licensing terms.
+
+##############################################################################
+# Modules and declarations
+##############################################################################
+
+package Wallet::ACL::Krb5::Regex;
+require 5.006;
+
+use strict;
+use warnings;
+use vars qw(@ISA $VERSION);
+
+use Wallet::ACL::Krb5;
+
+@ISA = qw(Wallet::ACL::Krb5);
+
+# This version should be increased on any code change to this module.  Always
+# use two digits for the minor version with a leading zero if necessary so
+# that it will sort properly.
+$VERSION = '0.01';
+
+##############################################################################
+# Interface
+##############################################################################
+
+# Returns true if the Perl regular expression specified by the ACL matches
+# the provided Kerberos principal.
+sub check {
+    my ($self, $principal, $acl) = @_;
+    unless ($principal) {
+        $self->error ('no principal specified');
+        return;
+    }
+    unless ($acl) {
+        $self->error ('no ACL specified');
+        return;
+    }
+    my $regex = eval { qr/$acl/ };
+    if ($@) {
+        $self->error ('malformed krb5-regex ACL');
+        return;
+    }
+    return ($principal =~ m/$regex/) ? 1 : 0;
+}
+
+1;
+__END__
+
+##############################################################################
+# Documentation
+##############################################################################
+
+=for stopwords
+ACL krb5-regex Durkacz Allbery verifier
+
+=head1 NAME
+
+Wallet::ACL::Krb5::Regex - Regex wallet ACL verifier for Kerberos principals
+
+=head1 SYNOPSIS
+
+    my $verifier = Wallet::ACL::Krb5::Regex->new;
+    my $status = $verifier->check ($principal, $acl);
+    if (not defined $status) {
+        die "Something failed: ", $verifier->error, "\n";
+    } elsif ($status) {
+        print "Access granted\n";
+    } else {
+        print "Access denied\n";
+    }
+
+=head1 DESCRIPTION
+
+Wallet::ACL::Krb5::Regex is the wallet ACL verifier used to verify ACL
+lines of type C<krb5-regex>.  The value of such an ACL is a Perl regular
+expression, and the ACL grants access to a given Kerberos principal if and
+only if the regular expression matches that principal.
+
+=head1 METHODS
+
+=over 4
+
+=item new()
+
+Creates a new ACL verifier.  For this verifier, there is no setup work.
+
+=item check(PRINCIPAL, ACL)
+
+Returns true if the Perl regular expression specified by the ACL matches the
+PRINCIPAL, false if not, and undef on an error (see L<"DIAGNOSTICS"> below).
+
+=item error()
+
+Returns the error if check() returned undef.
+
+=back
+
+=head1 DIAGNOSTICS
+
+=over 4
+
+=item malformed krb5-regex ACL
+
+The ACL parameter to check() was a malformed Perl regular expression.
+
+=item no principal specified
+
+The PRINCIPAL parameter to check() was undefined or the empty string.
+
+=item no ACL specified
+
+The ACL parameter to check() was undefined or the empty string.
+
+=back
+
+=head1 SEE ALSO
+
+Wallet::ACL(3), Wallet::ACL::Base(3), Wallet::ACL::Krb5(3), wallet-backend(8)
+
+This module is part of the wallet system.  The current version is
+available from L<http://www.eyrie.org/~eagle/software/wallet/>.
+
+=head1 AUTHOR
+
+Ian Durkacz
+
+=cut