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Bug #72693 mb_ereg_search increments search position when a match zero-width
Submitted: 2016-07-28 05:32 UTC Modified: 2016-07-28 11:59 UTC
From: ju1ius at laposte dot net Assigned: cmb (profile)
Status: Closed Package: mbstring related
PHP Version: 5.6.24 OS: Debian Sid
Private report: No CVE-ID: None
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From: ju1ius at laposte dot net
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 [2016-07-28 05:32 UTC] ju1ius at laposte dot net
Description:
------------
When provided a pattern that produces a zero-width match, mb_ereg_search increments search position by one, eventhough it shouldn't.



Test script:
---------------
<?php

mb_ereg_search_init('foo');

var_dump(mb_ereg_search('\A'));
var_dump(mb_ereg_search_getpos());

var_dump(mb_ereg_search('\s*'));
var_dump(mb_ereg_search_getpos());

var_dump(mb_ereg_search('\w+'));
var_dump(mb_ereg_search_getpos());
var_dump(mb_ereg_search_getregs());

var_dump(mb_ereg_search('\s*'));
var_dump(mb_ereg_search_getpos());

var_dump(mb_ereg_search('\Z'));
var_dump(mb_ereg_search_getpos());


Expected result:
----------------
bool(true)
int(0)

bool(true)
int(0)

bool(true)
int(3)
array(1) {
  [0]=>
  string(1) "foo"
}

bool(true)
int(3)

bool(true)
int(3)

Actual result:
--------------
// warnings suppressed, see bug #72691

bool(true)
int(1)

bool(true)
int(2)

bool(true)
int(3)
array(1) {
  [0]=>
  string(1) "o"
}

bool(true)
int(4)

bool(false)
int(3)

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2016-07-28 11:59 UTC] cmb@php.net
-Status: Open +Status: Verified -Assigned To: +Assigned To: cmb
 [2016-07-28 11:59 UTC] cmb@php.net
Confirmed: <https://3v4l.org/NMmr1>.
 [2016-07-28 12:27 UTC] cmb@php.net
Automatic comment on behalf of cmb
Revision: http://git.php.net/?p=php-src.git;a=commit;h=56cdaecb284b2b292ce1ecb076c1f8b041e47a02
Log: Fix #72693: mb_ereg_search increments search position when a match zero-width
 [2016-07-28 12:27 UTC] cmb@php.net
-Status: Verified +Status: Closed
 [2016-10-17 10:10 UTC] bwoebi@php.net
Automatic comment on behalf of cmb
Revision: http://git.php.net/?p=php-src.git;a=commit;h=56cdaecb284b2b292ce1ecb076c1f8b041e47a02
Log: Fix #72693: mb_ereg_search increments search position when a match zero-width
 
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