正则表达式测试

测试正则表达式，支持实时匹配、高亮和捕获组。免费使用，无需注册。

Regular Expression

//g

Global (g)Case insensitive (i)Multiline (m)Dotall (s)

Test String

About Regular Expressions

Regular expressions (regex) are powerful patterns used for matching, searching, and replacing text. They're essential for input validation, text processing, and data extraction. This tool tests your regex in real-time with JavaScript's regex engine.

Frequently Asked Questions

What is the difference between testing and matching?

Testing checks if a pattern matches a string at all (with the "g" flag, it finds all matches). Matching shows you where in the text the pattern was found and what was captured. Use tools like JSON Formatter to validate your data before testing patterns.

What do regex flags do?

The global flag (g) finds all matches; case-insensitive (i) ignores uppercase/lowercase; multiline (m) makes ^ and $ match line boundaries instead of string boundaries; dotall (s) makes . match newlines. Combine flags as needed.

How do I match email or phone numbers?

Email: /[^@]+@[^@]+\.[^@]+/. Phone (US): /\d3-\d3-\d4/. For real production use, check the validation best practices.

What's a capture group?

Parentheses in a regex create capture groups. For example, (\w+) captures one or more word characters. Groups are shown separately in the matches list, allowing you to extract specific parts of your match.

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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

常见用途

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

常见问题

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.