may not be the prettiest w/ the nested maps, but this works for any number of tiers .. it converts the "1.10.4" to "00001.00010.00004" and sorts that, which will sort properly, and then converts back to strip the leading zeros. (Note the caveat that the '%05d' might need to be '%08d' or something.) 
use strict;
use warnings;

my @s = ( "1.0", "1.10", "1.2", "3", "2.0.1", "4.1.1.1", "1.0.1", "1.1
+", "1.0.2", "2.0" );

my @t = map { join ".", map { sprintf '%d', $_ } split(/\./,$_)  }
        sort
        map { join ".", map { sprintf '%05d', $_ } split(/\./,$_)  }
        @s;

print "IN:  ", join("  ", @s), "\n";
print "OUT: ", join("  ", @t), "\n";

__END__
IN: 1.0  1.10  1.2  3  2.0.1  4.1.1.1  1.0.1  1.1  1.0.2  2.0
OUT: 1.0  1.0.1  1.0.2  1.1  1.2  1.10  2.0  2.0.1  3  4.1.1.1

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In reply to Re: Sorting Outline Numbers by davidrw
in thread Sorting Outline Numbers by Anonymous Monk

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