正则测试：写完立刻验证，不用等报错
正则表达式强大但容易出错：一个括号放错位置，匹配结果就完全变了。这个测试器让你输入正则与测试文本，实时高亮所有匹配，支持 g/i/m/s 全部标志位，匹配数量一目了然。
怎么调试正则
- 边写边看：修改正则立即刷新高亮，错误立刻现形。
- 验证标志位：切换大小写不敏感、多行、单行模式，理解每个 flag 对结果的影响。
- 作为学习工具：想弄懂某个正则做了什么，把样本贴进去看匹配结果。
适合谁
写爬虫、做日志清洗、处理文本提取的开发者，以及正在学正则的学生。正则一旦写对，能省下大量手写解析代码。
Regex Tester: verify patterns before they bite you
Regex is powerful but error-prone: one misplaced bracket changes everything. This tester lets you type a pattern and sample text, with matches highlighted live, supporting all g/i/m/s flags and showing the match count at a glance.
Debugging patterns
- See changes instantly: edit the pattern and the highlight refreshes immediately.
- Learn flags: toggle case-insensitive, multiline, dotall and see each one's effect.
- Deconstruct regexes: paste a pattern you found and see exactly what it matches.
Who it's for
Developers scraping, cleaning logs or extracting text, plus students learning regex. A correct pattern saves a lot of hand-written parsing code.