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    <p>The reason why you're encountering difficulties is the operator, <code>&lt;=&gt;</code> is the numeric comparison, <code>cmp</code> is the <em>default</em> and it is string comparison.</p> <pre><code>$ perl -E'say for sort qw/01 1 02 200/'; 01 02 1 200 </code></pre> <p>With a slight modification we get something much closer to correct:</p> <pre><code>$ perl -E'say for sort { $a &lt;=&gt; $b } qw/01 1 02 200/'; 01 1 02 200 </code></pre> <p>However, in your case you need to remove the non digits.</p> <pre><code>$ perl -E'say for sort { my $s1 = $a =~ m/(\d+)/; my $s2 = $b =~ /(\d+)/; $s1 &lt;=&gt; $s2 } qw/01 1 02 200/'; 01 1 02 200 </code></pre> <p>Here is it more pretty:</p> <pre><code>sort { my $s1 = $a =~ m/(\d+)/; my $s2 = $b =~ /(\d+)/; $s1 &lt;=&gt; $s2 } </code></pre> <p>This isn't flawless, but it should give you a good idea of your issue with sort.</p> <p>Oh, and as a follow up, the <strong>Shcwartzian Transform</strong> solves a different problem: it stops you from having to run a complex task (unlike the one you're needing -- a regex) multiple times in the search algorithm. It comes at a memory cost of having to cache the results (not to be unexpected). Essentially, what you do is map the input of the problem, to the output (typically in an array) <code>[$input, $output]</code> then you sort on the outputs <code>$a-&gt;[1] &lt;=&gt; $b-&gt;[1]</code>. With your stuff now sorted you map back over to get your original inputs <code>$_-&gt;[0]</code>.</p> <pre><code>map $_-&gt;[0], sort { $a-&gt;[1] &lt;=&gt; $b-&gt;[1] } map [ $_, fn($_) ] , qw/input list here/ ; </code></pre> <p>It is cool because it is so compact while being so efficient.</p>
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