#49247 [Opn->Bgs]: preg_match_all and \w issues

From: Date: Sat, 15 Aug 2009 01:22:23 +0000
Subject: #49247 [Opn->Bgs]: preg_match_all and \w issues
References: 1  Groups: php.bugs 
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 ID:               49247
 Updated by:       felipe@php.net
 Reported By:      mariusads at helpedia dot com
-Status:           Open
+Status:           Bogus
 Bug Type:         PCRE related
 Operating System: Windows 2003 Web Edition
 PHP Version:      5.2.10
 New Comment:

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to
report
a bug at http://bugs.php.net/how-to-report.php

See bug #49036


Previous Comments:
------------------------------------------------------------------------

[2009-08-13 23:16:35] mariusads at helpedia dot com

Description:
------------
I was under the impression that \w matches any word character, as in
a-z, A-Z, 0-9 and _ characters (documentation also says "some character
codes greater than 128 are used for accented letters, and these are
matched by \w" if a specific code page is used but it's not the case
here, it's a default PHP installation).

However, I have noticed the following issue and I'm not sure if it's a
bug in PHP or an error in the way I've written the regular expression in
the code below. As I understood regular expressions work, the code below
should not return any match but it does.



Reproduce code:
---------------
$text = 'start://abcd'.chr(255).chr(255).'efgh';

$results = preg_match_all('/(start:\/\/|finish:\/\/){1}([\w\x3A -
\x40]*)$/is',$text,$matches,PREG_OFFSET_CAPTURE);
var_dump($results,$matches);

Expected result:
----------------
The could above should return no matches. If the $ at the end is
omitted, I think it should return "start://abcd". Replacing \w with
0-9a-zA-Z_ produces the correct output.

Actual result:
--------------
Output of the above code:

int(1)
array(3) {
  [0]=>
  array(1) {
    [0]=>
    array(2) {
      [0]=>
      string(18) "start://abcd��efgh"
      [1]=>
      int(0)
    }
  }
  [1]=>
  array(1) {
    [0]=>
    array(2) {
      [0]=>
      string(8) "start://"
      [1]=>
      int(0)
    }
  }
  [2]=>
  array(1) {
    [0]=>
    array(2) {
      [0]=>
      string(10) "abcd��efgh"
      [1]=>
      int(8)
    }
  }
}



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


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