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Bug #45366 preg_match_all() misses elements (corner-case)
Submitted: 2008-06-26 13:37 UTC Modified: 2008-07-06 18:09 UTC
From: Arne dot Heizmann at csr dot com Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 5.2.6 OS: *
Private report: No CVE-ID: None
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From: Arne dot Heizmann at csr dot com
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 [2008-06-26 13:37 UTC] Arne dot Heizmann at csr dot com
Description:
------------
The following example code demonstrates that preg_match_all() does not always return all elements as it should.

Almost any change to the input string makes the bug no longer trigger. For example, remove one of the B's, and the bug no longer occurs. Same goes for the regexp: if you change the (?=X|Y) to (?=X) or anything simpler, the bug no longer triggers.

Reproduce code:
---------------
<?

    header ('Content-type: text/plain');
    $input = 'A, BBBBBBBB abcd abcd\'y';
    preg_match_all ("/[AB]+(?:\\s*\\w+)*(?=X|Y)|./si", $input, $output);
    var_export ($output);

?>


Expected result:
----------------
array (
  0 => 
  array (
    0 => 'A',
    1 => ',',
    2 => ' ',
    3 => 'B',
    4 => 'B',
    5 => 'B',
    6 => 'B',
    7 => 'B',
    8 => 'B',
    9 => 'B',
    10 => 'B',
    11 => ' ',
    12 => 'a',
    13 => 'b',
    14 => 'c',
    15 => 'd',
    16 => ' ',
    17 => 'a',
    18 => 'b',
    19 => 'c',
    20 => 'd',
    21 => '\'',
    22 => 'y',
  ),
)

Actual result:
--------------
array (
  0 => 
  array (
    0 => 'A',
    1 => ',',
    2 => ' ',
  ),
)

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 [2008-07-02 02:48 UTC] felipe@php.net
I can reproduce.

PS: The example works fine on pcretest (PCRE version 7.6).
 [2008-07-06 18:09 UTC] nlopess@php.net
backtrack limit reached.
use the following:
ini_set('pcre.backtrack_limit', PHP_INT_MAX);
 
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