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<?php preg_match_all('/(?:"?([^"]*)"?\s)?(?:<?(.+@[^>]+)>?)/', 'johndoe@example.com', $name_and_tags); var_dump($name_and_tags);
Output for 4.3.0 - 7.3.0rc4
array(3) { [0]=> array(1) { [0]=> string(19) "johndoe@example.com" } [1]=> array(1) { [0]=> string(0) "" } [2]=> array(1) { [0]=> string(19) "johndoe@example.com" } }