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run code in 150+ php & hhvm versions
Bugs & Features
<?php preg_match_all('(?:"?([^"]*)"?\s)?(?:<?(.+@[^>]+)>?)', 'Eric Peterson <foo@example.com>', $matches); print_r($matches);
Output for 5.2.0 - 7.1.0
Warning: preg_match_all(): Unknown modifier '?' in /in/KRrXu on line 3
Output for 4.3.11 - 5.1.6
Warning: preg_match_all(): Unknown modifier '?' in /in/KRrXu on line 3 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '?' in /in/KRrXu on line 3 Array ( )