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

go to bug id or search bugs for

Bug #77923 preg_* function cannot get correct result
Submitted: 2019-04-19 11:23 UTC Modified: 2019-04-20 05:52 UTC
From: 2317216477 at qq dot com Assigned:
Status: Not a bug Package: PCRE related
PHP Version: 7.2.18RC1 OS: any
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: 2317216477 at qq dot com
New email:
PHP Version: OS:

 

 [2019-04-19 11:23 UTC] 2317216477 at qq dot com 
Description:
------------
preg_* function cannot get correct result in php7.0~7.2 sometimes

the test string is too long so I put a test script on my github page(https://github.com/icy2003/php/blob/master/samples/php7preg_bug.php)

you can test this script on this website:https://3v4l.org/,or you can install php 7.0~7.2 in local environment

Test script:
---------------
https://github.com/icy2003/php/blob/master/samples/php7preg_bug.php

Expected result:
----------------
my pattern expected some results but in php7.0~7.2 it will be empty array!!

you can use "ini_set" and set "pcre.jit" to 0 before preg_* functions to fix the problem

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2019-04-19 11:33 UTC] 2317216477 at qq dot com 
You can use "ini_set" and set "pcre.jit" to 0 before preg_* functions to fix the problem
I don't know why it happens and hope someone can fix it basically
 [2019-04-20 05:52 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2019-04-20 05:52 UTC] requinix@php.net 
Your regular expression is too inefficient to be used with JIT mode on such a large input. PCRE (not PHP) is aborting executing because it ran out of stack space - preg_last_error() = PREG_JIT_STACKLIMIT_ERROR (6).

Disabling JIT for that regex is a workaround. Fixing the regex is better.

But personally I would consider using SimpleXML to find the <w:p> elements, scan for your ${var} or ${/var} tokens, then... I don't know what you want to do from there.
 [2019-04-22 01:56 UTC] 2317216477 at qq dot com 
I checked https://www.php.net/manual/zh/pcre.constants.php and I found Robert（a user added a note）said the same problem, I think it's still a problem for php7.0 to 7.2, for example,
this is my regular func:
preg_f()
and this is my pseudo code:
preg_f()
error = preg_last_error()
if(error){
preg_f()
}
Only if I re-match can I get the correct result, I think it is not reasonable because the logic:"I don't know I will be right or not until I checked preg_last_error()", that is ... I don't know, maybe stupid.
Maybe php7.0 to 7.2 should handle it itself, or just throw a fatal error so a user know the expression is correct or not in a certain way directly!
In a word, it returns a different result with php5 or php7.3+, it makes me puzzled
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved. 		Last updated: Sat Dec 20 07:00:01 2025 UTC