Home Backend Development PHP Tutorial preg_match regular matching prompt pcre.backtrack_limit solution_PHP tutorial

preg_match regular matching prompt pcre.backtrack_limit solution_PHP tutorial

Jul 13, 2016 am 10:56 AM
limit match p about Method match hint article regular solve

This article introduces the solution to the preg_match regular matching prompt pcre.backtrack_limit. Friends in need can refer to it.


Using preg_match to extract the target content, there is a problem with life and death, and the code is dead or alive.

Later I suspected that PHP's preg_match had a string length limit. Sure enough, I found that the value of "pcre.backtrack_limit" was only set to 100000 by default.

Solution:

 代码如下 复制代码
ini_set('pcre.backtrack_limit', 999999999);

Note: This parameter is available after PHP 5.2.0 version.

Also, let’s talk about:
pcre.recursion_limit

pcre.recursion_limit is the recursion limit of PCRE. If this item is set to a large value, the available stacks of all processes will be consumed, and eventually PHP will crash.

You can also limit it by modifying the configuration: In actual project applications, it is best to limit the memory: ini_set('memory_limit', '64M'); , which is more secure.

The code is as follows
 代码如下 复制代码
ini_set('pcre.recursion_limit', 99999);
Copy code

ini_set('pcre.recursion_limit' , 99999);

 代码如下 复制代码

pcre.backtrack_limit=-1

References for other solutions
The code is as follows

Copy code
pcre.backtrack_limit=-1 For more details, please check: http://www.bKjia.c0m/phper/31/42927.htm http://www.bkjia.com/PHPjc/632177.html
www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632177.htmlTechArticleThis article introduces the solution to the preg_match regular matching prompt pcre.backtrack_limit. Friends in need can refer to it. Use preg_match to extract the target content. If there is a problem, please replace...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Two Point Museum: All Exhibits And Where To Find Them
1 months ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What should I do if Google Chrome prompts that the content of this tab is being shared? What should I do if Google Chrome prompts that the content of this tab is being shared? Mar 13, 2024 pm 05:00 PM

What should I do if Google Chrome prompts that the content of this tab is being shared? When we use Google Chrome to open a new tab, we sometimes encounter a prompt that the content of this tab is being shared. So what is going on? Let this site provide users with a detailed introduction to the problem of Google Chrome prompting that the content of this tab is being shared. Google Chrome prompts that the content of this tab is being shared. Solution: 1. Open Google Chrome. You can see three dots in the upper right corner of the browser "Customize and control Google Chrome". Click the icon with the mouse to change the icon. 2. After clicking, the menu window of Google Chrome will pop up below, and the mouse will move to "More Tools"

Solution to the problem that Win11 system cannot install Chinese language pack Solution to the problem that Win11 system cannot install Chinese language pack Mar 09, 2024 am 09:48 AM

Solution to the problem that Win11 system cannot install Chinese language pack With the launch of Windows 11 system, many users began to upgrade their operating system to experience new functions and interfaces. However, some users found that they were unable to install the Chinese language pack after upgrading, which troubled their experience. In this article, we will discuss the reasons why Win11 system cannot install the Chinese language pack and provide some solutions to help users solve this problem. Cause Analysis First, let us analyze the inability of Win11 system to

Five tips to teach you how to solve the problem of Black Shark phone not turning on! Five tips to teach you how to solve the problem of Black Shark phone not turning on! Mar 24, 2024 pm 12:27 PM

As smartphone technology continues to develop, mobile phones play an increasingly important role in our daily lives. As a flagship phone focusing on gaming performance, the Black Shark phone is highly favored by players. However, sometimes we also face the situation that the Black Shark phone cannot be turned on. At this time, we need to take some measures to solve this problem. Next, let us share five tips to teach you how to solve the problem of Black Shark phone not turning on: Step 1: Check the battery power. First, make sure your Black Shark phone has enough power. It may be because the phone battery is exhausted

How to solve the problem of automatically saving pictures when publishing on Xiaohongshu? Where is the automatically saved image when posting? How to solve the problem of automatically saving pictures when publishing on Xiaohongshu? Where is the automatically saved image when posting? Mar 22, 2024 am 08:06 AM

With the continuous development of social media, Xiaohongshu has become a platform for more and more young people to share their lives and discover beautiful things. Many users are troubled by auto-save issues when posting images. So, how to solve this problem? 1. How to solve the problem of automatically saving pictures when publishing on Xiaohongshu? 1. Clear the cache First, we can try to clear the cache data of Xiaohongshu. The steps are as follows: (1) Open Xiaohongshu and click the "My" button in the lower right corner; (2) On the personal center page, find "Settings" and click it; (3) Scroll down and find the "Clear Cache" option. Click OK. After clearing the cache, re-enter Xiaohongshu and try to post pictures to see if the automatic saving problem is solved. 2. Update the Xiaohongshu version to ensure that your Xiaohongshu

The driver cannot be loaded on this device. How to solve it? (Personally tested and valid) The driver cannot be loaded on this device. How to solve it? (Personally tested and valid) Mar 14, 2024 pm 09:00 PM

Everyone knows that if the computer cannot load the driver, the device may not work properly or interact with the computer correctly. So how do we solve the problem when a prompt box pops up on the computer that the driver cannot be loaded on this device? The editor below will teach you two ways to easily solve the problem. Unable to load the driver on this device Solution 1. Search for "Kernel Isolation" in the Start menu. 2. Turn off Memory Integrity, and it will prompt "Memory Integrity has been turned off. Your device may be vulnerable." Click behind to ignore it, and it will not affect the use. 3. The problem can be solved after restarting the machine.

How can I make money by publishing articles on Toutiao today? How to earn more income by publishing articles on Toutiao today! How can I make money by publishing articles on Toutiao today? How to earn more income by publishing articles on Toutiao today! Mar 15, 2024 pm 04:13 PM

1. How can you make money by publishing articles on Toutiao today? How to earn more income by publishing articles on Toutiao today! 1. Activate basic rights and interests: original articles can earn profits by advertising, and videos must be original in horizontal screen mode to earn profits. 2. Activate the rights of 100 fans: if the number of fans reaches 100 fans or above, you can get profits from micro headlines, original Q&A creation and Q&A. 3. Insist on original works: Original works include articles, micro headlines, questions, etc., and are required to be more than 300 words. Please note that if illegally plagiarized works are published as original works, credit points will be deducted, and even any profits will be deducted. 4. Verticality: When writing articles in professional fields, you cannot write articles across fields at will. You will not get appropriate recommendations, you will not be able to achieve the professionalism and refinement of your work, and it will be difficult to attract fans and readers. 5. Activity: high activity,

How to solve the problem of low sound on Apple mobile phones How to solve the problem of low sound on Apple mobile phones Mar 08, 2024 pm 01:40 PM

The problem of low sound on Apple phones may be caused by many reasons. Users can try to solve the problem by adjusting the volume settings, checking the silent mode, clearing the speakers and earpieces, restarting the phone, checking the headphone jack, etc. How to solve the problem of low sound on Apple mobile phone 1. Adjust the volume setting First, make sure the volume setting of your mobile phone is correct. You can increase the volume by pressing the volume button (usually located on the side of the phone). In addition, you can also adjust the volume in "Sounds & Haptics" or "Sounds & Haptic Feedback" in settings. 2. Check the silent mode to make sure your phone is not in silent mode. You can look for the mute switch next to the volume buttons on the side. If the mute switch is on, the sound will be turned off. 3. Clean the speakers and earpieces. Sometimes the speakers and earpieces may be covered with dust.

How to solve the problem of garbled characters when importing Chinese data into Oracle? How to solve the problem of garbled characters when importing Chinese data into Oracle? Mar 10, 2024 am 09:54 AM

Title: Methods and code examples to solve the problem of garbled characters when importing Chinese data into Oracle. When importing Chinese data into Oracle database, garbled characters often appear. This may be due to incorrect database character set settings or encoding conversion problems during the import process. . In order to solve this problem, we can take some methods to ensure that the imported Chinese data can be displayed correctly. The following are some solutions and specific code examples: 1. Check the database character set settings In the Oracle database, the character set settings are

See all articles