#43104 [Opn]: preg_* not capturing regex optional last parenthesis value if empty

ID: 43104 Updated by: felipe@php.net Reported By: ch+php at 1111-internet dot com Status: Open Bug Type: PCRE related Operating System: n/a PHP Version: 4.4.7 New Comment: This is expected for flag different of default. (PREG_PATTERN_ORDER) Previous Comments: ------------------------------------------------------------------------ [2007-10-24 23:53:26] ch+php at 1111-internet dot com Description: ------------ The code and results attached show two examples of preg_* demonstrating how an optional parenthesis match at the end of a regular expression is not being captured if the optional condition is not matched. I think this is a bug, because if the optional parenthesis is not the last one in the regex, the empty value IS captured - which suggests that it should not be omitted just because it happens to be the last one. Reproduce code: --------------- preg_match_all("/(1)(23)?/", "12314123", $match, PREG_SET_ORDER); print_r($match); print_r(preg_split("/(1)(23)?/", "12314123", -1, PREG_SPLIT_DELIM_CAPTURE)); Expected result: ---------------- Array ( [0] => Array ( [0] => 123 [1] => 1 [2] => 23 ) [1] => Array ( [0] => 1 [1] => 1 [2] => ) [2] => Array ( [0] => 123 [1] => 1 [2] => 23 ) ) Array ( [0] => [1] => 1 [2] => 23 [3] => [4] => 1 [5] => [6] => 4 [7] => 1 [8] => 23 [9] => ) Actual result: -------------- Array ( [0] => Array ( [0] => 123 [1] => 1 [2] => 23 ) [1] => Array ( [0] => 1 [1] => 1 ) [2] => Array ( [0] => 123 [1] => 1 [2] => 23 ) ) Array ( [0] => [1] => 1 [2] => 23 [3] => [4] => 1 [5] => 4 [6] => 1 [7] => 23 [8] => ) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=43104&edit=1