From:
Operating system: Windows XP and Linux Server
PHP version: 5.3.2
Package: Regexps related
Bug Type: Bug
Bug description:RegEx matching fails
Description:
------------
When a RegEx "looks" over ~32768 times during a successful match, every
RegEx function fails and returns the empty string.
Test script:
---------------
<?php
$response = http_get("http://www.travelocity.com";);
// no problem with these first 2 RegExs
$response2 = preg_replace('/\s+/'," ",$response);
$mytitle =
preg_replace('/.*?<\s*title\s*>([^<]*)<.*/i','${1}',$response2);
echo "\nTitle Match Forward: ".$mytitle."\n\n";
// now, here's a problem
$mytitle2 =
preg_replace('/.*<\s*title\s*>([^<]*)<.*/i','${1}',$response2);
echo "\nTitle Match Backward: ".$mytitle2."\n\n";
?>
Expected result:
----------------
$mytitle gets extracted properly and echoed because the RegEx never looks
more than 32768 times starting at the beginning of the travelocity.com page
source. $mytitle2 never gets extracted because the RegEx looks more than
32768 times successfully and preg_replace() crashes into the empty string.
Matching forward for the title is working; matching backward for the title
is failing for large buffers.
Actual result:
--------------
Title Match Forward: Travelocity Travel: Airline Tickets, Hotels, Flights,
Vacations, Cruises & Car Rentals
Title Match Backward:
--
Edit bug report at http://bugs.php.net/bug.php?id=51777&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=51777&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=51777&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=51777&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=51777&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=51777&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=51777&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=51777&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=51777&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=51777&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=51777&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=51777&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=51777&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=51777&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=51777&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51777&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=51777&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=51777&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=51777&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=51777&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=51777&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=51777&r=mysqlcfg
