What is a regular expression?

A regular expression (regex) is a pattern used to match, search, and manipulate text. It's supported in virtually every programming language.

How do I test my regex?

Enter your regex pattern in the pattern field, add test text below, and the tool will highlight all matches in real-time. Flags like 'g' (global) and 'i' (case-insensitive) are supported.

Is my regex data safe?

Yes. All regex processing happens in your browser using JavaScript's built-in RegExp engine. No data is sent anywhere.

正则表达式测试器

实时测试正则表达式，支持匹配高亮和捕获组。

正则表达式

//g

全局匹配 (g)忽略大小写 (i)多行模式 (m)单行模式 (s)

测试字符串

关于正则表达式

正则表达式（regex）是用于匹配、搜索和替换文本的强大模式。它是输入验证、文本处理和数据提取中不可或缺的工具。本工具使用 JavaScript 正则引擎进行实时测试。

使用方法

Enter your regex pattern in the pattern field
Add flags (g for global, i for case-insensitive, m for multiline)
Type or paste your test text
View highlighted matches and match details in real-time

使用场景

Validating email addresses, URLs, or phone numbers
Extracting data from text (log parsing, web scraping)
Search and replace operations
Input validation in web forms

正则表达式测试器

关于正则表达式

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