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

ID: 43104 Updated by: nlopess@php.net Reported By: ch+php at 1111-internet dot com -Status: Open +Status: Wont fix Bug Type: PCRE related Operating System: n/a PHP Version: 4.4.7 New Comment: Yeah, it has been like this for ages, so we can't "fix" it. It will only add the optional captures if they are in the middle. In that case we add some empty padding values. Previous Comments: ------------------------------------------------------------------------ [2007-11-23 01:32:21] felipe@php.net This is expected for flag different of default. (PREG_PATTERN_ORDER) ------------------------------------------------------------------------ [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