正则表达式库
按类别浏览常用的正则表达式模式
电子邮件
Simple Email
^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$Matches a basic email address format
Email with Display Name
^[^<]*<[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}>$Matches an email with a display name like "John Doe <john@example.com>"
Email Domain Extraction
@([a-zA-Z0-9.-]+\.[a-zA-Z]{2,})Extracts the domain part from an email address
No-Reply Email
^no-?reply@Matches email addresses starting with no-reply or noreply
URL
URL with Protocol
^https?:\/\/[^\s/$.?#].[^\s]*$Matches a URL starting with http:// or https://
URL Slug
^[a-z0-9]+(?:-[a-z0-9]+)*$Matches a URL-safe slug with lowercase letters, numbers, and hyphens
Domain Name
^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$Matches a valid domain name like example.com or sub.domain.org
URL Query Parameter
[?&]([^=]+)=([^&]*)Extracts key=value pairs from URL query strings
YouTube Video ID
(?:youtube\.com\/watch\?v=|youtu\.be\/)([a-zA-Z0-9_-]{11})Extracts the 11-character video ID from YouTube URLs
日期与时间
ISO 8601 Date
^\d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$Matches dates in ISO 8601 format (YYYY-MM-DD)
Date (MM/DD/YYYY)
^(0[1-9]|1[0-2])\/(0[1-9]|[12]\d|3[01])\/\d{4}$Matches dates in US format (MM/DD/YYYY)
Date (DD/MM/YYYY)
^(0[1-9]|[12]\d|3[01])\/(0[1-9]|1[0-2])\/\d{4}$Matches dates in European format (DD/MM/YYYY)
24-Hour Time
^([01]\d|2[0-3]):([0-5]\d)(?::([0-5]\d))?$Matches time in 24-hour format with optional seconds
12-Hour Time
^(0?[1-9]|1[0-2]):[0-5]\d\s?(?:AM|PM|am|pm)$Matches time in 12-hour format with AM/PM
数字
Integer
^-?\d+$Matches positive or negative whole numbers
Decimal Number
^-?\d+\.?\d*$Matches positive or negative numbers with optional decimal part
Hex Color
^#(?:[0-9a-fA-F]{3}){1,2}$Matches 3 or 6 digit hex color codes with # prefix
Currency (USD)
^\$\d{1,3}(,\d{3})*(\.\d{2})?$Matches US dollar amounts with optional cents and thousands separators
Percentage
^-?\d+(\.\d+)?%$Matches percentage values with optional decimal part
电话
International Phone
^\+?[1-9]\d{1,14}$Matches international phone numbers in E.164 format
US Phone
^(\+1)?[-.\s]?\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}$Matches US phone numbers in various formats
Phone with Extension
^(\+?\d{1,3})?[-.\s]?\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{4}(\s*(ext|x|ext.)\s*\d{2,5})?$Matches phone numbers with optional country code and extension
Digits Only (Phone)
^\d{10,15}$Matches phone numbers as digit-only strings (10 to 15 digits)
IP 与网络
IPv4 Address
^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)$Matches a valid IPv4 address (0.0.0.0 to 255.255.255.255)
IPv4 with Port
^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?):(\d{1,5})$Matches an IPv4 address followed by a port number
IPv6 Address
^(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$Matches a full IPv6 address (8 groups of hex digits)
MAC Address
^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$Matches a MAC address with colon or dash separators
CIDR Notation
^(?:(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d\d?)\/(?:3[0-2]|[12]?\d)$Matches an IPv4 address with CIDR subnet notation
文件与路径
File Extension
\.([a-zA-Z0-9]+)$Extracts the file extension from a filename
Unix File Path
^\/(?:[^\/ ]+\/)*[^\/ ]+$Matches an absolute Unix/Linux file path
Windows File Path
^[a-zA-Z]:\\(?:[^\\/:*?"<>|\r\n]+\\)*[^\\/:*?"<>|\r\n]*$Matches an absolute Windows file path
Image File
\.(jpe?g|png|gif|bmp|svg|webp|ico|tiff?)$Matches filenames with common image extensions
密码
Min 8 Characters
^.{8,}$Matches any string with at least 8 characters
Strong Password
^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$Requires uppercase, lowercase, digit, and special character (min 8 chars)
No Spaces
^\S+$Matches strings that contain no whitespace characters
Alphanumeric Only
^[a-zA-Z0-9]+$Matches strings containing only letters and digits
HTML 与 XML
HTML Tag
<\/?[a-zA-Z][a-zA-Z0-9]*[^>]*>Matches opening and closing HTML tags
HTML Comment
<!--[\s\S]*?-->Matches HTML comments including multiline content
HTML Attribute
([a-zA-Z-]+)\s*=\s*"([^"]*)"Extracts attribute name and value pairs from HTML elements
Self-Closing Tag
<[a-zA-Z][a-zA-Z0-9]*[^>]*\/>Matches self-closing HTML/XML tags like <br /> or <img />
杂项
UUID v4
^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$Matches a UUID version 4 string (lowercase hex)
JWT Token
^[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+$Matches the three-part structure of a JSON Web Token
Markdown Link
\[([^\]]+)\]\(([^)]+)\)Matches Markdown-style links [text](url)
Semantic Version
^v?(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-([\da-zA-Z-]+(?:\.[\da-zA-Z-]+)*))?$Matches semantic version strings like 1.2.3 or v2.0.0-beta.1
Base64 String
^[A-Za-z0-9+/]*={0,2}$Matches valid Base64-encoded strings
了解更多
浏览精选的正则模式集合，涵盖邮箱、URL、日期等。
什么是正则表达式库？
正则表达式库是一份经过精心整理的模式集合，用于处理常见的校验和提取任务。你无需每次都从头编写正则表达式，而是可以直接浏览针对电子邮件、URL、日期、IP 地址等数十种格式、经过测试的现成模式。