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Bug #38599 Subpattern is not captured for backreference in some cases
Submitted: 2006-08-25 21:02 UTC Modified: 2006-08-28 06:15 UTC
From: pilotv at rambler dot ru Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 4.4.4 OS: All
Private report: No CVE-ID: None
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 [2006-08-25 21:02 UTC] pilotv at rambler dot ru
Description:
------------
(Sorry for my english)
Subpattern is not captured for backreference if it is followed by '?' and does not appear in subject string.

Reproduce code:
---------------
<?
$str=<<<EOD
<a href="aaa">
<a href='aaa'>
<a href=aaa>
EOD;

// Following RE works properly
$re='/<a href=(["\']?)(\w+)\1>/iS';
preg_match_all($re,$str,$regs,PREG_SET_ORDER);
print_r($regs);

// Following RE works wrong
$re='/<a href=(["\'])?(\w+)\1>/iS';
preg_match_all($re,$str,$regs,PREG_SET_ORDER);
print_r($regs);
?>


Expected result:
----------------
// Produced by 1st RE:
Array
(
    [0] => Array
        (
            [0] => <a href="aaa">
            [1] => "
            [2] => aaa
        )

    [1] => Array
        (
            [0] => <a href='aaa'>
            [1] => '
            [2] => aaa
        )

    [2] => Array
        (
            [0] => <a href=aaa>
            [1] => 
            [2] => aaa
        )

)


Actual result:
--------------
// Produced by 2nd RE:
Array
(
    [0] => Array
        (
            [0] => <a href="aaa">
            [1] => "
            [2] => aaa
        )

    [1] => Array
        (
            [0] => <a href='aaa'>
            [1] => '
            [2] => aaa
        )

)


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 [2006-08-25 21:38 UTC] tony2001@php.net
Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.2-win32-latest.zip


 [2006-08-25 23:17 UTC] pilotv at rambler dot ru
Sorry, I can not compile PHP myself here.
But I tryed latest available for download version 5.1.6. This bug is still present in it.
 [2006-08-28 06:15 UTC] tony2001@php.net
PCRE problems and limitations are not PHP problems.
 
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