sub byfile {
  my @a = split /(\d+)/, $a;
  my @b = split /(\d+)/, $b;
  my $M = @a > @b ? @a : @b;
  my $res = 0;
  for (my $i = 0; $i < $M; $i++) {
    return -1 if ! defined $a[$i];
    return 1 if  ! defined $b[$i];
    if ($a[$i] =~ /\d/) {
      $res = $a[$i] <=> $b[$i];
    } else {
      $res = $a[$i] cmp $b[$i];
    }
    last if $res;
  }
  $res;
}

@files = qw( 53 7 119 53red red5 red6 red7 red67 red6.jpg red12.jpg green4.jpg blue2.jpg blue1000.jpg blue2.jpg58);

@s = sort byfile @files;

$\ = $, = "\n";
print @s;

__END__
<lucs>   while (defined (my $A = shift @a) and defined (my $B = shift @b)) {
<lucs>     $res = ($A =~ /\d/) ? $A <=> $B : $A cmp $B;
<lucs>     return $res if $res;
<lucs>   }
<lucs>   return defined $A ? -1 : 1;