Bug #53823 [Opn->Ver]: preg_replace: * qualifier on unicode replace garbles the string

[aharvey]

Edit report at http://bugs.php.net/bug.php?id=53823&edit=1

 ID:                 53823
 Updated by:         ahar...@php.net
 Reported by:        keith at chaos-realm dot net
 Summary:            preg_replace: * qualifier on unicode replace garbles
                     the string
-Status:             Open
+Status:             Verified
 Type:               Bug
 Package:            PCRE related
 Operating System:   Linux
 PHP Version:        5.3SVN-2011-01-23 (snap)
 Block user comment: N
 Private report:     N

 New Comment:

Verified on 5.3 and trunk.


Previous Comments:
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[2011-01-23 18:10:44] tino dot didriksen at gmail dot com

...and then I forget to change the *. Let's try that again...



These work as expected:

echo preg_replace('/[^\pL\pM]+/iu', '', 'áéíóú');

echo preg_replace('/[^\pL\pM\pN]+/iu', '', 'áéíóú');

------------------------------------------------------------------------
[2011-01-23 18:09:23] tino dot didriksen at gmail dot com

A workaround is to use + instead of *.



These work as expected:

echo preg_replace('/[^\pL\pM]*/iu', '', 'áéíóú');

echo preg_replace('/[^\pL\pM\pN]*/iu', '', 'áéíóú');

------------------------------------------------------------------------
[2011-01-23 18:04:49] keith at chaos-realm dot net

.

------------------------------------------------------------------------
[2011-01-23 18:00:57] keith at chaos-realm dot net

Description:
------------
When using the following test script to strip out all unicode except for
letters the string becomes garbled when the * qualifier is added, the
only surviving character that is intact is ú.



Also, if you add \pN to the exceptions it additionally preserves the
ó.



Verified on 5.2,5.3 and 5.3-SNAP.



Test script:
---------------
echo preg_replace('/[^\pL\pM]*/iu', '', 'áéíóú');

or

echo preg_replace('/[^\pL\pM\pN]*/iu', '', 'áéíóú');

Expected result:
----------------
áéíóú

Actual result:
--------------
����ú

or 

���óú (if \pN is added to the exceptions).


------------------------------------------------------------------------



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Edit this bug report at http://bugs.php.net/bug.php?id=53823&edit=1