<?php
$array = array('cat', 'hat', 'sat');
$iterator = new ArrayIterator($array);
# Simple regex
$regexIterator = new RegexIterator($iterator, '/.at/');
var_dump($regexIterator->getRegex());
# Empty regular expression
$regexIterator = new RegexIterator($iterator, '//');
var_dump($regexIterator->getRegex());
# "Complex" email regular expression
$regexIterator = new RegexIterator($iterator, '|\\b[A-Z0-9._%-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b|');
var_dump($regexIterator->getRegex());
