# These constants make the code below more readable.
#
use constant {
    IX_FILENAME => 0,
    IX_RUN      => 1,
    IX_DISTRICT => 2,
    IX_COPY     => 3,
    IX_TOTAL    => 4,
};

# Read this bit from bottom to top:
#
my @sorted =
    # Now we've sorted our arrayrefs by the fields we're interested in
    # we loop through them again, pulling out just the filename and
    # discarding the other parts.
    map {
        $_->[IX_FILENAME]
    }
    # Sort by the fields we're interested in. Note that if the two
    # values for RUN are different, this will sort by them, and everyt
+hing
    # following the first 'or' is ignored. If they're the same, that
    # comparison returns 0, so the stuff after 'or' isn't ignored,
    # and we compare by DISTRICT, then COPY, then TOTAL.
    sort {
        $a->[IX_RUN]      <=> $b->[IX_RUN]       or
        $a->[IX_DISTRICT] <=> $b->[IX_DISTRICT]  or
        $a->[IX_COPY]     <=> $b->[IX_COPY]      or
        $a->[IX_TOTAL]    <=> $b->[IX_TOTAL]        
    }
    # For each filename, split it into an arrayref, so that the first
    # element in the arrayref is the filename itself, and the rest are
    # the fields we're interested in.
    map {
        [ $_, m/\A[A-Z0-9]+_([0-9])+_ETSTexas_.*_Candidate_RRD_([0-9]+
+)_([0-9]{2})_([0-9]{2})/i ]
    }
    # Take our list of filenames…
    @files;

# Check it works. (It does.)
#
print Dumper(\@sorted);
[download]

---

---

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