用正则表达式判断输入的数字是否合法的例子_PHP
正则表达式
$in="2344";
if(ereg("^(-{0,1}|\+{0,1})[0-9]+(\.{0,1}[0-9]+)$",$in))
echo "Ok!";
else
echo "Sorry,Please input again!";
?>
很简单的嘛！
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Disabling Win11 Input Experience Guide
Dec 27, 2023 am 11:07 AM
Recently, many Win11 users have encountered the problem that the input experience dialog box always flickers and cannot be turned off. This is actually caused by the default system services and components of Win11. We need to disable the relevant services first, and then disable the input experience service. Solved, let’s try it out together. How to turn off the input experience in win11: First step, right-click the start menu and open "Task Manager". Second step, find the three processes "CTF Loader", "MicrosoftIME" and "Service Host: Textinput Management Service" in order, right-click "End Task" "The third step, open the start menu, search and open "Services" at the top. The fourth step, find "Textinp" in it
![Windows input encounters hang or high memory usage [Fix]](https://img.php.cn/upload/article/000/887/227/170835409686241.jpg?x-oss-process=image/resize,m_fill,h_207,w_330)
Windows input encounters hang or high memory usage [Fix]
Feb 19, 2024 pm 10:48 PM
The Windows input experience is a key system service responsible for processing user input from various human interface devices. It starts automatically at system startup and runs in the background. However, sometimes this service may automatically hang or occupy too much memory, resulting in reduced system performance. Therefore, it is crucial to monitor and manage this process in a timely manner to ensure system efficiency and stability. In this article, we will share how to fix issues where the Windows input experience hangs or causes high memory usage. The Windows Input Experience Service does not have a user interface, but it is closely related to handling basic system tasks and functions related to input devices. Its role is to help the Windows system understand every input entered by the user.
Five selected Go language open source projects to take you to explore the technology world
Jan 30, 2024 am 09:08 AM
In today's era of rapid technological development, programming languages are springing up like mushrooms after a rain. One of the languages that has attracted much attention is the Go language, which is loved by many developers for its simplicity, efficiency, concurrency safety and other features. The Go language is known for its strong ecosystem with many excellent open source projects. This article will introduce five selected Go language open source projects and lead readers to explore the world of Go language open source projects. KubernetesKubernetes is an open source container orchestration engine for automated
Go language development essentials: 5 popular framework recommendations
Mar 24, 2024 pm 01:15 PM
"Go Language Development Essentials: 5 Popular Framework Recommendations" As a fast and efficient programming language, Go language is favored by more and more developers. In order to improve development efficiency and optimize code structure, many developers choose to use frameworks to quickly build applications. In the world of Go language, there are many excellent frameworks to choose from. This article will introduce 5 popular Go language frameworks and provide specific code examples to help readers better understand and use these frameworks. 1.GinGin is a lightweight web framework with fast
jQuery usage practice: several ways to determine whether a variable is empty
Feb 27, 2024 pm 04:12 PM
jQuery is a JavaScript library widely used in web development. It provides many simple and convenient methods to operate web page elements and handle events. In actual development, we often encounter situations where we need to determine whether a variable is empty. This article will introduce several common methods of using jQuery to determine whether a variable is empty, and attach specific code examples. Method 1: Use the if statement to determine varstr="";if(str){co
Solve win11 search bar input problem
Dec 26, 2023 pm 12:07 PM
The search bar is a very useful function in the win11 system, which can help us find the settings, functions and services we want. However, some friends have encountered the situation where the win11 search bar cannot be entered. We can modify the relevant data in the registry to solve the problem. Let's follow the editor to solve it. What to do if you can’t type in the win11 search bar 1. First, we can press “win+r” on the keyboard to bring up run. 2. Then enter "regedit" and press Enter to open the Registry Editor. 3. Then enter "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Expl" in the path above
How to determine whether a date is the previous day in Go language?
Mar 24, 2024 am 10:09 AM
Question: How to determine whether the date is the previous day in Go language? In daily development, we often encounter situations where we need to determine whether the date is the previous day. In the Go language, we can implement this function through time calculation. The following will be combined with specific code examples to demonstrate how to determine whether the date is the previous day in Go language. First, we need to import the time package in the Go language. The code is as follows: import("time") Then, we define a function IsYest
How to input word matrix
Mar 19, 2024 pm 11:00 PM
Matrix is a formula we often use and encounter, but do you know how to input a matrix in word? Many people may have never been exposed to it and will feel confused when using it. So, here we will share with you how to input the word matrix. I hope that sharing this technique can bring help and inspiration to you. 1. First, create and open a word document. In order to demonstrate the operation, we will use a blank document for demonstration. As shown in the figure below: 2. If we want to input the matrix, we need to find the [Insert] button in the menu bar. This button can insert many content options, such as pictures, etc., all from this menu bar. 3. After clicking [Insert], look on the right side of our tool options and you can find [Formula], and then we click [
