PHP regular expression collection
Regular expression, also known as regular expression, is called Regular Expression in English. It is often abbreviated as regex, regexp or RE in the code. It is a concept in computer science. Regular tables are usually used to retrieve and replace text that matches a certain pattern (rule). A regular expression is a logical formula that operates on strings (including ordinary characters (for example, letters between a to z) and special characters (called "metacharacters")), which uses some predefined specific characters. , and the combination of these specific characters form a "rule string". This "rule string" is used to express a filtering logic for strings. A regular expression is a text pattern that describes one or more strings to match when searching for text.
The following is a collection of some commonly used regular expressions:
Only numbers can be entered: "^[0-9]*$"
Only n digits can be entered Numbers: "^\d{n}$"
Only numbers with at least n digits can be entered: "^\d{n,}$"
Only m ~ n digits can be entered Numbers: "^\d{m,n}$"
Only numbers starting with zero and non-zero can be entered: "^(0|[1-9][0-9]*)$"
You can only enter positive real numbers with two decimal places: "^[0-9]+(.[0-9]{2})?$"
You can only enter 1 ~Positive real numbers with 3 decimal places: "^[0-9]+(.[0-9]{1,3})?$"
Only non-zero positive integers can be entered: "^\ +?[1-9][0-9]*$"
Only non-zero negative integers can be entered: "^\-[1-9][0-9]*$"
Only characters with a length of 3 digits can be entered: "^.{3}$"
Only a string of 26 English letters can be entered: "^[A-Za-z]+$ "
Only a string consisting of 26 uppercase English letters can be entered: "^[A-Z]+$"
Only a string consisting of 26 lowercase English letters can be entered:" ^[a-z]+$"
You can only enter a string consisting of numbers and 26 English letters: "^[A-Za-z0-9]+$"
Only Enter a string consisting of numbers, 26 English letters or underscores: "^\w+$"
Verify user password: "^[a-zA-Z]\w{5,17}$" Correct Format bit: starts with a letter, has a length between 6 and 18, and can only contain characters, numbers and underscores
Verify whether it contains illegal characters ^(?:[\u4e00-\u9fa5]*\w*\ s*)+$
Only Chinese characters can be entered: "^[\u4e00-\u9fa5]{0,}$"
Verify email address: "^\w+([-+. ]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"
Verify InternetURL:"^http://([\ w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?$"
China Phone Number Verification
Matching Form Such as: 0511-4405222 or 021-87888822 or 021-44055520-555 or (0511)4405222
Regular expression "((d{3,4})|d{3,4}-)?d {7,8}(-d{3})*"
China Postal Code Verification
Matching format such as: 215421
Regular expression "d{6}"
Email verification
The matching form is: justali@justdn.com
Regular expression "w+([-+.]w+)*@w+([-. ]w+)*.w+([-.]w+)*"
ID card verification
Matching format such as: 15-digit or 18-digit ID card
Regular expression "d{18}|d{15}"
Commonly used number verification
Regular expression
"d{n}" n is the specified length
"d{n,m}" The length range from n to m
Illegal character verification
Match characters that exclude illegal characters such as:
Regular expression^(? :[\u4e00-\u9fa5]*\w*\s*)+$
Date verification
The matching format is: 20030718,030718
Range: 1900-- 2099
Regular expression ((((19){1}|(20){1})d{2})|d{2})[01]{1}d{1}[0 -3]{1}d{1}
<html>
<head>
<title>php正则表达式集锦实例</title>
<script language="javascript" type="text/javascript">
function Button1_onclick(){
if(!test_hanzi(document.form1.Text1.value)){
alert("姓名只能是汉字");
return false;
}
return true;
}
//验证电子邮件
function test_email(strEmail){
var myReg = /^[_a-z0-9]+@([_a-z0-9]+\.)+[a-z0-9]{2,3}$/;
if(myReg.test(strEmail)) return true;
return false;
}
//只能输入数字
function test_shuzi(strshuzi){
var myReg =/^[0-9]*$/;
if(myReg.test(strshuzi)) return true;
return false;
}
//只能输入汉字
function test_hanzi(strhanzi){
var myReg =/^[\u4e00-\u9fa5]{0,}$/;
if(myReg.test(strhanzi)) return true;
return false;
}
</script>
</head>
<body>
<form name="form1">姓名:
<input id="Text1" name="Text1" type="text" />
<input name="按钮" type="button" id="Button1" onclick="return Button1_onclick()" value="button" language="javascript" />
</form>
</body>
</html>The above is a collection of PHP expressions. I hope it is helpful to everyone and can be used in future work.
Related recommendations:
Detailed explanation of commonly used functions in php regular expressions
Instance analysis of php regular expressions
The ten most practical PHP regular expressions
Summary of regular expressions commonly used in PHP forms
Summary of commonly used regular expressions
The above is the detailed content of PHP regular expression collection. For more information, please follow other related articles on the PHP Chinese website!
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
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
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
