About This Tool
What is 正则表达式测试工具?
A tool for testing regular expressions with real-time matching against test strings. Used for debugging and developing regex patterns for string searching, validation, and text parsing in development workflows.
How to Use
- Enter your regex pattern in the top input field.
- Enter the test string in the area below.
- Matching portions are highlighted in real-time.
- Configure flags (case insensitive, multiline, etc.) to adjust matching behavior.
Key Features
- Real-time regex matching with highlighting
- Case insensitive, multiline, and dotAll flags
- Detailed match text, position, and capture group display
- ECMAScript, RE2, and PCRE2 engine selection
Tips
- For email validation, use standardized regex patterns rather than simple ones.
- Capture groups () allow you to extract specific matched portions.
- Using the ? quantifier performs lazy (non-greedy) matching instead of the default greedy matching.
正则表达式测试工具
实时匹配测试正则表达式
//g
Frequently Asked Questions
ECMAScript、RE2和PCRE2引擎有什么区别？▼
ECMAScript是JavaScript的标准正则引擎。RE2（Go、Google使用）更快且保证线性时间，但缺少反向引用和前瞻等功能。PCRE2（PHP、Nginx使用）功能最丰富，支持递归、条件模式等。
'g'（全局）标志有什么作用？何时使用？▼
没有'g'标志时，正则在首次匹配后停止。有'g'时会查找所有匹配。需要查找或替换所有出现时使用'g'。注意：在JavaScript中，将'g'与test()一起使用可能因lastIndex状态产生不一致结果。
如何匹配跨多行的文本？▼
默认情况下，^和$匹配整个字符串的开头/结尾，.不匹配换行符。启用'm'（多行）标志使^和$匹配行边界。启用's'（dotAll）标志使.也匹配换行字符。