Description:
------------
There is a regression in the RecursiveRegexIterator iterator. Detected by the failure of a test in the Hoa\Iterator library. Test script from the documentation (http://php.net/recursiveregexiterator.construct).

Test script:
---------------
<?php
$rArrayIterator = new RecursiveArrayIterator(array('test1', array('tet3', 'test4', 'test5')));
$rRegexIterator = new RecursiveRegexIterator($rArrayIterator, '/^test/',
    RecursiveRegexIterator::ALL_MATCHES);

foreach ($rRegexIterator as $key1 => $value1) {

    if ($rRegexIterator->hasChildren()) {

        // print all children
        echo "Children: ";
        foreach ($rRegexIterator->getChildren() as $key => $value) {
            echo $value . " ";
        }
        echo "\n";
    } else {
        echo "No children\n";
    }

}
?>


Expected result:
----------------
No children
Children: test4 test5

Actual result:
--------------
Aucun fils disponible
PHP Notice:  Array to string conversion in /tmp/a.php on line 6

Notice: Array to string conversion in /tmp/a.php on line 6
Fils : test4 test5