Write a simple regular method in JS
这次给大家带来在JS里编写简单的正则方式,在JS里编写正则方式的注意事项有哪些,下面就是实战案例,一起来看一下。
在字面量方式中,我们//之间包起来的所有的内容都是元字符,有的具有特殊意义,大部分都是代表本身含义的普通的元字符
var name = 'wo'; var reg = /^\d+"+name+"\d+$/
为了解决上述想在正则里面加上一个变量这样的需求,我们只能使用实例创建的方式了
var reg = new RegExp("^\\d+"+name+"\\d+$","g")
字面量方式和实例创建的方式在正则中的区别?
1、字面量方式中出现的一切都是元字符,所以不能进行变量值的拼接,而实例创建的方式是可以的。
2、字面量中直接写\d就可以,而在实例中需要把它转译\\d
练习正则:
1、年龄介于18-65 // 年龄介于18-19 20-59 60-65
var reg = /^(1[8,9] | [2,5]\d | 6[0,5])$/
2、验证邮箱的正则(简版)
邮箱左边的规律:数字、字母、下划线、.、-
var reg = /^[\w.-]+@[0-9a-zA-Z]+(\.[a-zA-Z]{2,4}){1,2}$/
3、中国标准真实姓名 2-4位汉字
var reg = /^[\u4e00-\u9fa5]{2,4}$/
4、身份证号码
var reg = /^\d{17}(\d | x)$/ var reg = /^\(d{2})(\d{4})(\d{4})(\d{2})(\d{2})(\d{2})(\d)(\d | X)$/
相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!
推荐阅读:
The above is the detailed content of Write a simple regular method in JS. 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



How to use WebSocket and JavaScript to implement an online speech recognition system Introduction: With the continuous development of technology, speech recognition technology has become an important part of the field of artificial intelligence. The online speech recognition system based on WebSocket and JavaScript has the characteristics of low latency, real-time and cross-platform, and has become a widely used solution. This article will introduce how to use WebSocket and JavaScript to implement an online speech recognition system.

WebSocket and JavaScript: Key technologies for realizing real-time monitoring systems Introduction: With the rapid development of Internet technology, real-time monitoring systems have been widely used in various fields. One of the key technologies to achieve real-time monitoring is the combination of WebSocket and JavaScript. This article will introduce the application of WebSocket and JavaScript in real-time monitoring systems, give code examples, and explain their implementation principles in detail. 1. WebSocket technology

Introduction to how to use JavaScript and WebSocket to implement a real-time online ordering system: With the popularity of the Internet and the advancement of technology, more and more restaurants have begun to provide online ordering services. In order to implement a real-time online ordering system, we can use JavaScript and WebSocket technology. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can realize real-time two-way communication between the client and the server. In the real-time online ordering system, when the user selects dishes and places an order

How to use WebSocket and JavaScript to implement an online reservation system. In today's digital era, more and more businesses and services need to provide online reservation functions. It is crucial to implement an efficient and real-time online reservation system. This article will introduce how to use WebSocket and JavaScript to implement an online reservation system, and provide specific code examples. 1. What is WebSocket? WebSocket is a full-duplex method on a single TCP connection.

JavaScript and WebSocket: Building an efficient real-time weather forecast system Introduction: Today, the accuracy of weather forecasts is of great significance to daily life and decision-making. As technology develops, we can provide more accurate and reliable weather forecasts by obtaining weather data in real time. In this article, we will learn how to use JavaScript and WebSocket technology to build an efficient real-time weather forecast system. This article will demonstrate the implementation process through specific code examples. We

Golang regular expressions use the pipe character | to match multiple words or strings, separating each option as a logical OR expression. For example: matches "fox" or "dog": fox|dog matches "quick", "brown" or "lazy": (quick|brown|lazy) matches "Go", "Python" or "Java": Go|Python |Java matches words or 4-digit zip codes: ([a-zA

JavaScript tutorial: How to get HTTP status code, specific code examples are required. Preface: In web development, data interaction with the server is often involved. When communicating with the server, we often need to obtain the returned HTTP status code to determine whether the operation is successful, and perform corresponding processing based on different status codes. This article will teach you how to use JavaScript to obtain HTTP status codes and provide some practical code examples. Using XMLHttpRequest

Usage: In JavaScript, the insertBefore() method is used to insert a new node in the DOM tree. This method requires two parameters: the new node to be inserted and the reference node (that is, the node where the new node will be inserted).
