Re: How can I do a numeric sort on a substring?

[AnomalousMonk]

Here's another example of the Schwartzian mentioned earlier. I've written it as a "one-liner" although that's not the form I'd prefer for production code for reasons of readability/maintainability. I've added more test values in different formats to illustrate the effects of the regex that is used.

Win8 Strawberry 5.8.9.5 (32)  Fri 06/25/2021 11:50:17
C:\@Work\Perl\monks
>perl
use strict;
use warnings;

use Test::More tests => 1;
1..1

my @in   = qw/a-3  21-2 a-2  bb-10  c--11-1  a-1  def-2-99/;
my @want = qw/a-1  a-2  def-2-99  a-3  bb-10  c--11-1  21-2/;

my @got = map $_->[0], sort { $a->[1] <=> $b->[1] } map [ $_, /\d+/g ]
+, @in;

is_deeply \@got, \@want;
^Z
ok 1

Another consideration when sorting is "stability." See the discussion of this here and in the sort pragma. See also Guttman and Rosler's A Fresh Look at Efficient Perl Sorting for lots more info on Perl sorting.