Description:
------------
nutsort function does not order strings with dash charater in proper order.

Test script:
---------------
<?php

$arr = [
  'Saint-Prex',
  'Saint Prex',
  'Saint Genis Pouilly',
];

natsort($arr);

print_r($arr);


Expected result:
----------------
Array
(
    [0] => Saint Genis Pouilly
    [2] => Saint Prex
    [1] => Saint-Prex
)


Actual result:
--------------
Array
(
    [0] => Saint-Prex
    [2] => Saint Genis Pouilly
    [1] => Saint Prex
)