1--TEST-- 2x (PCRE_EXTENDED) modifier 3--FILE-- 4<?php 5 6var_dump(preg_match('/a e i o u/', 'aeiou', $m)); 7var_dump($m); 8 9var_dump(preg_match('/a e i o u/x', 'aeiou', $m)); 10var_dump($m); 11 12var_dump(preg_match("/a e\ni\to\ru/x", 'aeiou', $m)); 13var_dump($m); 14 15?> 16--EXPECT-- 17int(0) 18array(0) { 19} 20int(1) 21array(1) { 22 [0]=> 23 string(5) "aeiou" 24} 25int(1) 26array(1) { 27 [0]=> 28 string(5) "aeiou" 29} 30