1--TEST-- 2Study regex 3--FILE-- 4<?php 5 6var_dump(preg_match('/(?:(?:(?:(?:(?:(.))))))/ S', 'aeiou', $dump)); 7var_dump($dump[1]); 8var_dump(preg_match('/(?:(?:(?:(?:(?:(.))))))/', 'aeiou', $dump)); 9var_dump($dump[1]); 10 11var_dump(preg_match('/(?>..)((?:(?>.)|.|.|.|u))/S', 'aeiou', $dump)); 12var_dump($dump[1]); 13 14// try to trigger usual "match known text" optimization 15var_dump(preg_match('/^aeiou$/S', 'aeiou', $dump)); 16var_dump($dump[0]); 17var_dump(preg_match('/aeiou/S', 'aeiou', $dump)); 18var_dump($dump[0]); 19 20?> 21--EXPECT-- 22int(1) 23string(1) "a" 24int(1) 25string(1) "a" 26int(1) 27string(1) "i" 28int(1) 29string(5) "aeiou" 30int(1) 31string(5) "aeiou" 32
