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Using sprintf to stringify a number, you may want to check its range to avoid negatives or overflow surprises:
my $id = shift; # disallow ID 0; $id > 0 && $id < 1e9 or return q(); $id = sprintf '%0*lu', ($id < 1e6 ? 6 : 9), $id; ...
Or, you could let perl stringify the number, and munge it from there.
sub id2path { my $id = shift; # allow ID 0; disallow 12.34 $id =~ m/^\d{1,9}$/ or return q(); my $n = length($id) > 6 ? 3 : 2; $id = sprintf '%0*s', 3 * $n, $id; $_ = "/$_/" for substr($id, $n, $n); # or: substr($id, $_, 0, '/') for -2*$n, -$n; return $id; }
Interestingly, perl sprintf allows zero-padding of %s! Is this a documented feature?

In reply to Re: Can you make it nicer? by oiskuu
in thread Can you make it nicer? by choroba

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