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Bug #80866 preg_split ignores limit flag when pattern with \K has 0-width fullstring match
Submitted: 2021-03-15 02:02 UTC Modified: -
From: mickmackusa at mickmack dot usa Assigned:
Status: Closed Package: PCRE related
PHP Version: 7.3.27 OS:
Private report: No CVE-ID: None
 [2021-03-15 02:02 UTC] mickmackusa at mickmack dot usa
Description:
------------
preg_split() does not respect the limit parameter when \K is used to produce a zero-width fullstring delimiter. https://3v4l.org/kQHQZ This bug seems to be present since PHP7.3.  Other preg_split() calls using zero-width-match-producing regular expressions do not suffer the same bug. 
https://3v4l.org/3KP1T

Test script:
---------------
var_export(preg_split('~.{3}\K~', 'abcdefghijklm', 3));

Expected result:
----------------
array (
  0 => 'abc',
  1 => 'def',
  2 => 'ghijklm',
)

Actual result:
--------------
array (
  0 => 'abc',
  1 => 'def',
  2 => 'ghi',
  3 => 'jkl',
  4 => 'm',
)

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2021-03-15 12:23 UTC] dharman@php.net
The following pull request has been associated:

Patch Name: Fix bug 80866
On GitHub:  https://github.com/php/php-src/pull/6774
Patch:      https://github.com/php/php-src/pull/6774.patch
 [2021-03-15 13:48 UTC] nikic@php.net
Automatic comment on behalf of tekiela246@gmail.com
Revision: http://git.php.net/?p=php-src.git;a=commit;h=282355efd5d53ba180d30794737c33898031104e
Log: Fix bug #80866
 [2021-03-15 13:48 UTC] nikic@php.net
-Status: Open +Status: Closed
 
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