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<?php preg_match_all('(?:"?([^"]*)"?\s)?(?:<?(.+@[^>]+)>?)', "John <johndoe@example.com>", $name_and_email); var_dump($name_and_email);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match_all(): Unknown modifier '?' in /in/rIZev on line 3 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier '?': [(?:"?([^"]*)"?\s)?(?:<?(.+@[^>]+)>?)] in /in/rIZev on line 3 NULL
Output for 4.3.11 - 5.1.6
Warning: preg_match_all(): Unknown modifier '?' in /in/rIZev on line 3 array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier '?' in /in/rIZev on line 3 array(0) { }