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Bug #49399 mb_ereg_replace() '\b' fails with mbstrings
Submitted: 2009-08-28 13:17 UTC Modified: 2009-12-13 22:15 UTC
Votes:1
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: manfred at mabuweb dot com Assigned: moriyoshi (profile)
Status: Not a bug Package: mbstring related
PHP Version: 5.2.10 OS: linux
Private report: No CVE-ID: None
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 [2009-08-28 13:17 UTC] manfred at mabuweb dot com 
Description:
------------
mb_ereg_replace() and mb_eregi_replace() misinterpretate MBchars as word end.

Reproduce code:
---------------
  $pattern = '\bas\b';
  $string = 'D?as';
  echo $string.'<br/>';
  echo mb_ereg_replace($pattern,  '', $string);


Expected result:
----------------
D?as
D?as


Actual result:
--------------
D?as
D?

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 [2009-12-13 19:32 UTC] felipe@php.net 
I can reproduce it only in 5.2.
 [2009-12-13 20:32 UTC] manfred at mabuweb dot com 
I've no 5.3 version to try, but I just tried in 5.2.11 and can reproduce the error.
 [2009-12-13 20:32 UTC] jani@php.net 
I can't:

# php -v
PHP 5.2.12RC2-dev (cli) (built: Nov 22 2009 02:36:43)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2009 Zend Technologies
# php t.php
D?as
D?as
 [2009-12-13 20:34 UTC] jani@php.net 
Exactly what encodings are you using? (check phpinfo() for mbstring.*)

# php -i |grep mbstring\\.
mbstring.detect_order => no value => no value
mbstring.encoding_translation => Off => Off
mbstring.func_overload => 7 => 7
mbstring.http_input => pass => pass
mbstring.http_output => pass => pass
mbstring.internal_encoding => UTF-8 => UTF-8
mbstring.language => neutral => neutral
mbstring.strict_detection => Off => Off
mbstring.substitute_character => no value => no value
 [2009-12-13 21:49 UTC] manfred at mabuweb dot com 
Good question!

php -i |grep mbstring
mbstring.detect_order => no value => no value
mbstring.encoding_translation => Off => Off
mbstring.func_overload => 0 => 0
mbstring.http_input => pass => pass
mbstring.http_output => pass => pass
mbstring.internal_encoding => ISO-8859-1 => no value
mbstring.language => neutral => neutral
mbstring.substitute_character => no value => no value

If I change to UTF-8 everything seems to work as expected:
ini_set('mbstring.internal_encoding', 'UTF-8');
 [2009-12-13 22:15 UTC] jani@php.net 
Exactly..
 
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