php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Bug #48589 /\Q$z\E/ matches every string
Submitted: 2009-06-17 20:23 UTC Modified: 2009-06-17 23:04 UTC
From: mjs at beebo dot org Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 5.2.9 OS: OS X
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If this is not your bug, you can add a comment by following this link.
If this is your bug, but you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: mjs at beebo dot org
New email:
PHP Version: OS:

 

 [2009-06-17 20:23 UTC] mjs at beebo dot org 
Description:
------------
The regular expression /\Q$z\E/ matches (as far as I can tell) every 
string.  It certainly matches some strings it shouldn't match:

preg_match("/\Q$z\E/", "") -> MATCH (WRONG!)
preg_match("/\Q$z\E/", "qqqq") -> MATCH (WRONG!)

preg_match("/\Q $z\E/", "qqqq") -> NO MATCH (CORRECT)
preg_match("/\Q $z\E/", " $z") -> MATCH (CORRECT)
preg_match("/\Q\$z\E/", "\$z") -> MATCH (CORRECT)
preg_match("/\Q\$z\E/", "$z") -> NO MATCH (CORRECT)

The problem seems to occur if the regular expression begins with the 
string "\Q$" followed by at least one character.

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2009-06-17 20:45 UTC] mjs at beebo dot org 
Regexp documentation:

http://php.net/manual/en/regexp.reference.php
 [2009-06-17 22:58 UTC] felipe@php.net 
No bug there, the '$z' enclosed by double quotes is interpreted as a variable first.

http://docs.php.net/manual/en/language.types.string.php
 [2009-06-17 23:04 UTC] mjs at beebo dot org 
Ah yes of course, apologies.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Fri May 24 00:01:31 2024 UTC