This is all in your datastructure. I would envision that you would convert the six lines above to something that would look similar to:

$VAR1 = {
    clock => 'blah/1',
    pin => 'blah/2',
    net => 'blah/3',
    clock_skew => '0.100',
    longest_delay => '1.000',
    shortest_delay => '1.100',
};
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If you do that, and have an array of these hashrefs, the sorting is very simple.

my @values = generate_data_from_some_datasource($data_source);
# @values is now an array of hashrefs, each looking like the one above

my @sorted_values = sort { $a->{clock} cmp $b->{clock} } @values;
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The right data structure produces the easiest code. Now, instead of 'clock', you could, if a fellow was motivated, have an option that could be passed in. The trick is to make sure you're doing the right sort. cmp is alphanumeric sorting. <=> is numeric sorting. (A fellow, if interested, might look at creating objects that use overloaded sorting comparators, but that's probably overkill here.)