Hi levW,

this is a typical case for using the Schwartzian Transform (see https://en.wikipedia.org/wiki/Schwartzian_transform): 

use strict;
use warnings;
use feature "say";

my @array = qw(Patch_11.4 Patch_1.0 Patch_2.0 Patch_3.1 Patch_5.0 Patc
+h_4.2 Patch_6.0
               Patch_11.0 Patch_7.0 Patch_8.0 Patch_9.3 Patch_10.2 Pat
+ch_11.2);

@array = map { $_->[0] } 
    sort { $a->[1] <=> $b->[1] or $a->[2] <=> $b->[2] } 
    map { /Patch_(\d+)\.(\d+)/; [$_, $1, $2] } @array;

say for @array;

[download]
The map on the last line creates an anonymous array in which the items are array refs containing the whole string, the first number and the second number (for example: [Patch_11.4, 11, 4]). The items are then sorted according to the first number and then according to the second number. At the end, the map on the first line retrieves the original strings from the sorted array refs.

Output: 

$ perl sort_versions.pl
Patch_1.0
Patch_2.0
Patch_3.1
Patch_4.2
Patch_5.0
Patch_6.0
Patch_7.0
Patch_8.0
Patch_9.3
Patch_10.2
Patch_11.0
Patch_11.2
Patch_11.4

[download]

In reply to Re: sorting an array with decimal points by Laurent_R
in thread sorting an array with decimal points by levW

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