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Bug #31895 PREG_SPLIT_DELIM_CAPTURE returns delimiter twice
Submitted: 2005-02-09 13:53 UTC Modified: 2005-06-28 22:55 UTC
From: peter dot bauwens at b-rail dot be Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 5CVS, 4CVS (2005-05-30) OS: *
Private report: No CVE-ID: None
View Developer Edit
 [2005-02-09 13:53 UTC] peter dot bauwens at b-rail dot be 
Description:
------------
If you use preg_split with the PREG_SPLIT_DELIM_CAPTURE flag, the delimiter is returned twice.

This bug also occurs in PHP 5.0.3.

I only added mssql and cpdf support in php.ini (has no relevance, I think).

Reproduce code:
---------------
<?php
  $From = "HR_PersFunUit LEFT JOIN HR_Pers ON HR_PersFunUit.IDNR = HR_Pers.IDNR";
  $Stukken = preg_split("/(( LEFT JOIN )|( RIGHT JOIN )|( INNER JOIN )|( ON ))/", $From, -1, PREG_SPLIT_DELIM_CAPTURE);
  print_r($Stukken);
?>

Expected result:
----------------
Array
(
    [0] => HR_PersFunUit
    [1] =>  LEFT JOIN 
    [2] => HR_Pers
    [3] =>  ON 
    [4] => HR_PersFunUit.IDNR = HR_Pers.IDNR
)


Actual result:
--------------
Array
(
    [0] => HR_PersFunUit
    [1] =>  LEFT JOIN 
    [2] =>  LEFT JOIN 
    [3] => HR_Pers
    [4] =>  ON 
    [5] => 
    [6] => 
    [7] => 
    [8] =>  ON 
    [9] => HR_PersFunUit.IDNR = HR_Pers.IDNR
)

Patches

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 [2005-02-09 22:39 UTC] iliaa@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip

Works fine on Win32 and Linux when I tried the given code.
 [2005-02-10 08:37 UTC] peter dot bauwens at b-rail dot be 
The bug still occurs in this snapshot of PHP 4.3.11-dev(Win32, same result).
I used the 'php.ini-recommended' as php.ini (didn't change a thing in it).
Is there any way to get more info to help you? (I also know C, C++, ASM if it helps in any way)
 [2005-02-10 15:00 UTC] sniper@php.net 
Are you absolutely sure you've installed the new PHP version correctly ?? Make sure you remove _all_ previous dlls related to PHP before you install the new ones from the snapshot.
 [2005-02-10 15:10 UTC] peter dot bauwens at b-rail dot be 
I used a totally different directory for the PHP snapshot, 
copied the php.ini in the Windows-dir, 
I changed my path in the httpd.conf of my Apache2 server, and restarted the server.
In phpinfo() I got the 'version 4.3.11-dev'...
 [2005-02-10 15:16 UTC] peter dot bauwens at b-rail dot be 
I just found out something new (I hope it helps)
If I try these 2 lines:

$String = "test 12 test 123 test 123 test";
print_r(preg_split("/( 12(3){0,1} )/", $String, -1, PREG_SPLIT_DELIM_CAPTURE));

I get this as result: 
Array
(
    [0] => test
    [1] =>  12 
    [2] => test
    [3] =>  123 
    [4] => 3
    [5] => test
    [6] =>  123 
    [7] => 3
    [8] => test
)
 [2005-02-11 05:52 UTC] sniper@php.net 
Verified.
 [2005-06-27 01:22 UTC] tony2001@php.net 
Please try using this CVS snapshot:

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

PCRE was upgraded to version 5.0.
 [2005-06-28 22:13 UTC] peter dot bauwens at b-rail dot be 
I tried the Win32 snapshot, but the bug still exists.
The recognicion is good, but I get to much return-values...
 [2005-06-28 22:55 UTC] nlopess@php.net 
This is totally bogus, because you are using capturing parentheses. If you change the supplied test cases to (?:) they will work as expected.

Lets see test #2:
$String = "test 12 test 123 test 123 test";
print_r(preg_split("/( 12(?:3){0,1} )/", $String, -1, PREG_SPLIT_DELIM_CAPTURE)); // note the ?: there

outputs:
(
    [0] => test
    [1] =>  12
    [2] => test
    [3] =>  123
    [4] => test
    [5] =>  123
    [6] => test
)
 
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