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run code in 150+ php & hhvm versions
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<?php $regex = <<<REGEX / \A|\n\s* (@[\pL-_]+) \ * (?s:(.*?)) (?=\n\s*\@|\Z) /ux REGEX; $comment = <<<COMMENT @see MyTag this is a @description that spans multiple lines @internal @author Mike van Riel <me@mikevanriel.com> COMMENT; var_dump(preg_match_all($regex, $comment, $matches, PREG_SET_ORDER)); var_dump($matches);
based on KCOcI
Output for 4.4.0 - 4.4.9, 5.0.5 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(6) array(6) { [0]=> array(1) { [0]=> string(0) "" } [1]=> array(3) { [0]=> string(22) " @see MyTag this is a" [1]=> string(4) "@see" [2]=> string(15) "MyTag this is a" } [2]=> array(3) { [0]=> string(39) " @description that spans multiple lines" [1]=> string(12) "@description" [2]=> string(26) " that spans multiple lines" } [3]=> array(3) { [0]=> string(11) " @internal" [1]=> string(9) "@internal" [2]=> string(0) "" } [4]=> array(3) { [0]=> string(27) " @author Mike van Riel <me" [1]=> string(7) "@author" [2]=> string(17) "Mike van Riel <me" } [5]=> array(3) { [0]=> string(17) "@mikevanriel.com>" [1]=> string(12) "@mikevanriel" [2]=> string(5) ".com>" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11, 5.0.0 - 5.0.4
Warning: preg_match_all(): Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 37 in /in/EpV9K on line 20 bool(false) array(0) { }
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: PCRE does not support \L, \l, \N, \P, \p, \U, \u, or \X at offset 37 in /in/EpV9K on line 20 bool(false) array(0) { }