正则表达式测试工具
在线测试正则表达式，实时匹配高亮。支持 g/i/m 标志位，结果显示捕获组。
Regex Tester — Live RegEx Highlighting in Browser
工具介绍
Regular expressions are the Swiss Army knife of text processing. This tool uses the ECMAScript (JavaScript) engine, supports all major flags (g / i / m / s / u / y), and highlights matches in real time. Capture groups are listed below. No IDE needed — paste your pattern and test text to debug instantly.
怎么使用
- Type your pattern in the regex box (no / / slashes needed)
- Paste your test text below
- All matches are highlighted; capture groups appear underneath
常见用例
- Validating email, phone, URL, ID number formats
- Extracting IPs, timestamps, and error codes from logs
- Bulk find/replace workflows (combine with Diff tool)
- Learning regex syntax: see cause and effect live
常见问题
Q: Which engine is used?
A: JavaScript / ECMAScript. Python / Go differ slightly (e.g. Python re supports \A).
Q: Match vs capture group?
A: Match is the whole pattern; capture groups are (...) subpatterns listed below.
Q: Common beginner pitfalls?
A: Forgetting to escape . + * ?; using \d incorrectly in string literals (write \\d).
小贴士
Use non-greedy quantifiers to avoid over-matching: .* → .*?
Look up common patterns (email / URL / IP) in any regex cheatsheet
For complex patterns, add inline comments with (?# comment)