正则表达式测试
实时匹配高亮、分组查看与常用正则库。
关于「正则表达式测试」
它属于「开发辅助」分类：前端与后端开发中经常用到的小工具。
完全免费、无需注册；所有处理都在浏览器本地完成，文件不会上传到任何服务器。
相关关键词：正则表达式测试、开发辅助、正则、regex、匹配、在线工具、免费
如何使用「正则表达式测试」
- 打开工具：打开「正则表达式测试」页面，无需注册、无需安装任何软件。
- 准备输入：准备好要处理的内容或文件：文本可直接粘贴，文件可拖入页面（本工具属于「开发辅助」）。
- 填入内容：把内容粘贴进输入框，或把文件拖入页面；也可以点击「示例」先填入样例数据试一下。
- 设置选项并处理：按需调整页面上的选项，然后点击处理 / 转换 / 生成按钮。
- 获取结果：处理完全在浏览器本地完成，结果可直接复制或下载，文件不会上传到任何服务器。
常见问题
- 为什么高亮和计数不一致？
- 若正则含空匹配（如 ^$）会出现无限循环，工具已做 lastIndex 自增保护。
- 支持 lookbehind 吗？
- 取决于浏览器；现代 Chromium 支持 (?<=)。
Regex Tester (English)
Live match highlight, group view and common regex library.
Belongs to “Dev Tools”: Small utilities frequently used in front-end and back-end development.
Free, no sign-up; everything runs locally in your browser and files are never uploaded.
Keywords: Regex Tester, Dev Tools, regex, match, online tool, free
How to use it
- Open the tool：Open the “Regex Tester” page — no sign-up and nothing to install.
- Prepare the input：Prepare the content or file to process: paste text or drop a file onto the page (this tool belongs to “Dev Tools”).
- Provide the input：Paste your content into the input box or drop a file onto the page; you can also click “Sample” to try example data first.
- Adjust options and run：Adjust the options if needed, then click the process / convert / generate button.
- Get the result：Everything runs locally in your browser; copy or download the result — your files are never uploaded.
FAQ
- Why do highlight and count differ?
- An empty match (e.g. ^$) could loop forever; the tool protects with lastIndex auto-increment.
- Does it support lookbehind?
- It depends on the browser; modern Chromium supports (?<=).
More tools in Dev Tools
- Unix Timestamp Converter — Convert sec/ms timestamps to dates, multi-timezone.
- Cron Expression Parser — Explain cron and predict next run times.
- QR Code Generator — Generate QR codes with custom color and error correction.
- QR Code Reader — Upload an image or screenshot to read its QR content.
- Code Diff — Show line-level diff of two code snippets side by side.
- SQL Formatter — Uppercase SQL keywords and indent for readability.
- CSS Formatter — Beautify and minify CSS code.
- HTML Beautifier — Indent and minify HTML source.
- JS Formatter — Indent-beautify and minify JavaScript.
- Naming Style Converter — Camel, snake, kebab and constant case conversion.
- Color Converter — HEX/RGB/HSL conversion and palette generation.
- CSS Loading Spinners — Pick a loading spinner and copy ready-made HTML/CSS.
- View Source — Paste HTML source for structured viewing and beautifying.
- User-Agent Parser — Parse OS and engine info from a browser UA.
- Local Info — View local IP, screen and browser environment.
- Xget URL Accelerator — Convert raw URLs like GitHub, npm, Docker and AI APIs into Xget-accelerated links in one click.