#50887 [NEW]: preg_match , last optional sub-patterns ignored when empy

From: Date: Sat, 30 Jan 2010 16:58:58 +0000
Subject: #50887 [NEW]: preg_match , last optional sub-patterns ignored when empy
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-147066@lists.php.net to get a copy of this message 
From:             harrrrpo at gmail dot com
Operating system: Windows
PHP version:      5.3.1
PHP Bug Type:     PCRE related
Bug description:  preg_match , last optional sub-patterns ignored when empy

Description:
------------
in preg_match , when optional sub-patterns (using ? or {0,n} ) are the
last sub-patterns and empty (e.g. not matched) they are ignored in $matches
array
this behavior is inconsistent with preg_match_all , and with the case when
the empty optional sub-pattern isn't the last one

Reproduce code:
---------------
$str="1";
preg_match("#\d(\d)?#",$str,$mt);
var_dump($mt);

Expected result:
----------------
array(2) {
  [0]=>
  string(1) "1"
  [1]=>
  string(0) ""
}

(the string(0) "" does appear on all cases with preg_match_all , and with
preg_match , when there is any additional sub-patterns after it)

Actual result:
--------------
array(1) {
  [0]=>
  string(1) "1"
}

(the value of sub-pattern vanished)

-- 
Edit bug report at http://bugs.php.net/?id=50887&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=50887&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=50887&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=50887&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=50887&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=50887&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=50887&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=50887&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=50887&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=50887&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=50887&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=50887&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=50887&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=50887&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=50887&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=50887&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=50887&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=50887&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=50887&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=50887&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=50887&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=50887&r=mysqlcfg

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