diff --git a/btrbk b/btrbk
index e27ea9a..910bf5d 100755
--- a/btrbk
+++ b/btrbk
@@ -57,19 +57,6 @@ my  $VERSION_INFO    = "btrbk command line client, version $VERSION";
 
 my @config_src = ("/etc/btrbk.conf", "/etc/btrbk/btrbk.conf");
 
-my $ip_addr_match = qr/(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])/;
-my $host_name_match = qr/(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])/;
-my $file_match = qr/[0-9a-zA-Z_@\+\-\.\/]+/;  # note: ubuntu uses '@' in the subvolume layout: <https://help.ubuntu.com/community/btrfs>
-my $glob_match = qr/[0-9a-zA-Z_@\+\-\.\/\*]+/;  # file_match plus '*'
-my $uuid_match = qr/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/;
-my $timestamp_postfix_match = qr/\.(?<YYYY>[0-9]{4})(?<MM>[0-9]{2})(?<DD>[0-9]{2})(T(?<hh>[0-9]{2})(?<mm>[0-9]{2})((?<ss>[0-9]{2})(?<zz>(Z|[+-][0-9]{4})))?)?(_(?<NN>[0-9]+))?/;  # matches "YYYYMMDD[Thhmm[ss+0000]][_NN]"
-my $raw_postfix_match = qr/--(?<received_uuid>$uuid_match)(\@(?<parent_uuid>$uuid_match))?\.btrfs?(\.(?<compress>(gz|bz2|xz)))?(\.(?<encrypt>gpg))?(\.(?<incomplete>part))?/;  # matches ".btrfs_<received_uuid>[@<parent_uuid>][.gz|bz2|xz][.gpg][.part]"
-my $group_match = qr/[a-zA-Z0-9_:-]+/;
-my $ssh_cipher_match = qr/[a-z0-9][a-z0-9@.-]+/;
-my $safe_cmd_match = $file_match;  # good enough
-
-my %day_of_week_map = ( sunday => 0, monday => 1, tuesday => 2, wednesday => 3, thursday => 4, friday => 5, saturday => 6 );
-my @syslog_facilities = qw( user mail daemon auth lpr news cron authpriv local0 local1 local2 local3 local4 local5 local6 local7 );
 my %compression = (
   gzip   => { name => 'gzip',   format => 'gz',  compress_cmd => [ 'gzip',   '-c' ], decompress_cmd => [ 'gzip',   '-d', '-c' ], level_min => 1, level_max => 9 },
   pigz   => { name => 'pigz',   format => 'gz',  compress_cmd => [ 'pigz',   '-c' ], decompress_cmd => [ 'pigz',   '-d', '-c' ], level_min => 1, level_max => 9, threads => '-p' },
@@ -79,6 +66,22 @@ my %compression = (
   lzo    => { name => 'lzo',    format => 'lzo', compress_cmd => [ 'lzop',   '-c' ], decompress_cmd => [ 'lzop',   '-d', '-c' ], level_min => 1, level_max => 9 },
  );
 
+my $compress_format_alt = join '|', map { $_->{format} } values %compression; # note: this contains duplicate alternations
+my $ip_addr_match = qr/(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])/;
+my $host_name_match = qr/(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])/;
+my $file_match = qr/[0-9a-zA-Z_@\+\-\.\/]+/;  # note: ubuntu uses '@' in the subvolume layout: <https://help.ubuntu.com/community/btrfs>
+my $glob_match = qr/[0-9a-zA-Z_@\+\-\.\/\*]+/;  # file_match plus '*'
+my $uuid_match = qr/[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/;
+my $timestamp_postfix_match = qr/\.(?<YYYY>[0-9]{4})(?<MM>[0-9]{2})(?<DD>[0-9]{2})(T(?<hh>[0-9]{2})(?<mm>[0-9]{2})((?<ss>[0-9]{2})(?<zz>(Z|[+-][0-9]{4})))?)?(_(?<NN>[0-9]+))?/;  # matches "YYYYMMDD[Thhmm[ss+0000]][_NN]"
+my $raw_postfix_match = qr/--(?<received_uuid>$uuid_match)(\@(?<parent_uuid>$uuid_match))?\.btrfs?(\.(?<compress>($compress_format_alt)))?(\.(?<encrypt>gpg))?(\.(?<incomplete>part))?/;  # matches ".btrfs_<received_uuid>[@<parent_uuid>][.gz|bz2|xz][.gpg][.part]"
+
+my $group_match = qr/[a-zA-Z0-9_:-]+/;
+my $ssh_cipher_match = qr/[a-z0-9][a-z0-9@.-]+/;
+my $safe_cmd_match = $file_match;  # good enough
+
+my %day_of_week_map = ( sunday => 0, monday => 1, tuesday => 2, wednesday => 3, thursday => 4, friday => 5, saturday => 6 );
+my @syslog_facilities = qw( user mail daemon auth lpr news cron authpriv local0 local1 local2 local3 local4 local5 local6 local7 );
+
 my %config_options = (
   # NOTE: the parser always maps "no" to undef
   # NOTE: keys "volume", "subvolume" and "target" are hardcoded