From: spoon dot reloaded at gmail dot com
Operating system: Linux
PHP version: 5.3.0
PHP Bug Type: PCRE related
Bug description: PCRE Recursive Pattern Doesn't Work
Description:
------------
I have a recursive PCRE pattern that should match any string (it does in
Perl), but it fails to match a very simple string in PHP. I have reproduced
this on both 5.2 and 5.3.
Reproduce code:
---------------
echo preg_match('/^(|.(?1))$/', 'ab'), "\n";
Expected result:
----------------
I expect it to print "1", because the pattern matches. In Perl, 'ab' =~
/^(|.(?1))$/ indeed matches. In fact, this pattern should match any string,
because it matches either an empty string, or any character followed by
something that matches the main part of the pattern itself (which matches
any string).
Actual result:
--------------
It prints "0", indicating that it did not match.
--
Edit bug report at http://bugs.php.net/?id=49550&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=49550&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=49550&r=trysnapshot53
Try a snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=49550&r=trysnapshot60
Fixed in SVN:
http://bugs.php.net/fix.php?id=49550&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=49550&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=49550&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=49550&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=49550&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=49550&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=49550&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=49550&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=49550&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=49550&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=49550&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=49550&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=49550&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=49550&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=49550&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=49550&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=49550&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=49550&r=mysqlcfg
