From:
Operating system: Linux, Windows
PHP version: 5.3.5
Package: PCRE related
Bug Type: Bug
Bug description:PCRE preg_match incorrectly matches negated character class
Description:
------------
The perl-compatible regex matcher somehow matches a negated character class
if the string to match contains the same characters, and in the same order,
as the character class.
I don't see why /[^ab]/ should match "ab" but not "ba". Perl agrees:
$ perl -e 'for("ab","ba") { print "$_: "; if( /[^ab]/ ) {print "match\n"}
else {print "no match\n"}}'
ab: no match
ba: no match
Test script:
---------------
<?php
echo "expecting 0, 0, 0, 0, 0\n";
echo preg_match( '[^ab]', 'ba' ) . "\n"; // expected no match,
passes
echo preg_match( '[^ab]', 'ab' ) . "\n"; // expected no match,
fails
echo preg_match( '([^ab])', 'ab' ) . "\n"; // expected no match,
passes
echo preg_match( '[^ab]', 'aba' ) . "\n"; // expected no match, fails
echo preg_match( '[^ab]', 'abb' ) . "\n"; // expected no match, fails
echo preg_match( '([^ab])', 'abb' ) . "\n"; // expected no match,
passes
?>
Expected result:
----------------
expecting 0, 0, 0, 0, 0, 0
0
0
0
0
0
0
Actual result:
--------------
expecting 0, 0, 0, 0, 0, 0
0
1
0
1
1
0
--
Edit bug report at http://bugs.php.net/bug.php?id=54099&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=54099&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=54099&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=54099&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=54099&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=54099&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=54099&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=54099&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=54099&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=54099&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=54099&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=54099&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=54099&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=54099&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=54099&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54099&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=54099&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=54099&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=54099&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=54099&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=54099&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=54099&r=mysqlcfg
