Description:
------------
This week I updated php and pcre through homebrew. As a result I got pcre2 10.37. For that specific version preg_match doesn't work as expected. Reverting only pcre2 to 10.36 makes it work again.

The regex originates from https://github.com/phpspec/phpspec/blob/eb0d939b235f6091a8439a2a2fc144c9e0d5f569/src/PhpSpec/CodeAnalysis/TokenizedNamespaceResolver.php#L119

Homebrew issue: https://github.com/Homebrew/homebrew-core/issues/78635

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

$matches = [];
$test = ' App\Domain\Repository\MetaData\SomethingRepositoryInterface';

preg_match('/\\\\([^\\\\]+)\s*$/', $test, $matches);
var_dump($matches);

$test2 = ' App\Domain\Exception\NotFoundException';

preg_match('/\\\\([^\\\\]+)\s*$/', $test2, $matches);
var_dump($matches);

Expected result:
----------------
array(2) {
  [0]=>
  string(29) "\SomethingRepositoryInterface"
  [1]=>
  string(28) "SomethingRepositoryInterface"
}
array(2) {
  [0]=>
  string(18) "\NotFoundException"
  [1]=>
  string(17) "NotFoundException"
}

Actual result:
--------------
array(0) {
}
array(2) {
  [0]=>
  string(18) "\NotFoundException"
  [1]=>
  string(17) "NotFoundException"
}