#45260 [Opn->Bgs]: Recursive Capturing Subpattern

From: Date: Fri, 13 Jun 2008 16:46:35 +0000
Subject: #45260 [Opn->Bgs]: Recursive Capturing Subpattern
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-125758@lists.php.net to get a copy of this message 
 ID:               45260
 Updated by:       felipe@php.net
 Reported By:      ralph at deboom dot biz
-Status:           Open
+Status:           Bogus
 Bug Type:         PCRE related
 Operating System: Debian Etch 4.0+
 PHP Version:      5.2.6
 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

"If a capturing subpattern is matched repeatedly, it is the last
portion
of the string that it matched that is returned."
- http://pcre.org/pcre.txt


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

[2008-06-13 13:32:03] ralph at deboom dot biz

$value = 'sub.sub2.sub3.sub4.domain.ext';
if
(preg_match("/^(([a-z0-9]+)(([\.|\-]{1}[a-z0-9]+)|(?R))*\.([a-z]{2,6}))$/i",$value,$match))
{	
 	print_R($match);
}

Thanks to a crappy textarea form I cant properly outline the code..
just indent it yourself ^^

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

[2008-06-13 13:29:48] ralph at deboom dot biz

Description:
------------
A recursive subpattern turns out to overwrite data of the previous
matched call... Thus it will only show the last recursive match it made
in the pattern...



Reproduce code:
---------------
$value = 'sub.sub2.sub3.sub4.domain.ext';
if
(preg_match("/^(([a-z0-9]+)(([\.|\-]{1}[a-z0-9]+)|(?R))*\.([a-z]{2,6}))$/i",
$value, $match)) {	
 	print_R($match);
}


Expected result:
----------------
Array
(
    [0] => sub.sub2.sub3.sub4.domain.ext
    [1] => sub.sub2.sub3.sub4.domain.ext
    [2] => sub
    [3] => .sub2.sub3.sub4.domain
    [4] => .sub2.sub3.sub4.domain
    [5] => ext
)

Actual result:
--------------
Array
(
    [0] => sub.sub2.sub3.sub4.domain.ext
    [1] => sub.sub2.sub3.sub4.domain.ext
    [2] => sub
    [3] => .domain
    [4] => .domain
    [5] => ext
)


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


-- 
Edit this bug report at http://bugs.php.net/?id=45260&edit=1

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