Description:
------------
While testing code for matching password complexity, I noticed the \p{Lu} matches all uppercase characters correctly, but \p{Ll} fails to match accented characters. The German "double s" character is debatable whether it should pass or fail. It is definitively a lowercase character, but it has no uppercase variant. Therefore, by definition or \p{Ll} it should not match, but all other cases I can find for it in PCRE examples do have it match \p{Ll}. I have included it as passing as a lower case in the "expected" results below.

Test script:
---------------
<?php
// SHOULD PASS. Passes all 5.0.5 and thereafter.
$passwordTestArray[] = 'Aa';
// SHOULD PASS. Passes all 5.0.5 and thereafter.
$passwordTestArray[] = 'Æa';
// SHOULD PASS. Fails after 5.2.10. Passes 5.0.5 - 5.2.9
$passwordTestArray[] = 'Aæ';
// SHOULD PASS. Fails after 5.2.10. Passes 5.0.5 - 5.2.9
$passwordTestArray[] = 'Ææ';
// SHOULD FAIL because ß does not have an uppercase equiv. But it passses anyway in 5.0.5 - 5.2.9
$passwordTestArray[] = 'Aß';


// SHOULD FAIL because there is no uppercase ß.
// It fails for the wrong reasons in 5.0.5 - 5.2.9
// It passes in 5.2.10 and beyond.
$passwordTestArray[] = 'aß';


class PCREFail
{
    static public function verifyComplexity($plainTextPassword)
    {
        $re = "/(?=.*[\\p{Ll}])(?=.*[\\p{Lu}]).{2,}/";
        $found = preg_match_all($re, $plainTextPassword, $matches);
        if ($found) {
            return $matches;
        }
        return $found;
    }

}

foreach ($passwordTestArray as $passwordToTest) {
    var_dump(PCREFail::verifyComplexity($passwordToTest));
}

Expected result:
----------------
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(2) "Aa"
  }
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(3) "Æa"
  }
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(3) "Aæ"
  }
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(4) "Ææ"
  }
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(3) "Aß"
  }
}
int(0)

Actual result:
--------------
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(2) "Aa"
  }
}
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(3) "Æa"
  }
}
int(0)
int(0)
int(0)
array(1) {
  [0]=>
  array(1) {
    [0]=>
    string(3) "aß"
  }
}