Regex Tester

实时测试正则表达式。
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Live Matching

Highlights matches as you type the pattern.

Capture Groups

Shows numbered groups for each match.

Flag Toggles

Global, case-insensitive, multiline, dotAll.

Client-side

All processing in your browser. No data uploaded.

关于Regex Tester

Regular expressions (regex) are powerful patterns used to search, match, and manipulate text. They are an essential skill for software developers, data engineers, and system administrators — used everywhere from form validation and log parsing to URL routing and find-and-replace operations in code editors. This regex tester lets you write and debug JavaScript-flavoured regular expressions in real time. Type a pattern in the input field, add optional flags, then enter your test string in the textarea below. All matches are highlighted inline with distinct colours so you can see exactly what your pattern captures. A match detail panel below lists each match with its character index and any captured groups. Four flags are supported: g (global — find all matches), i (case-insensitive), m (multiline — ^ and $ match line boundaries), and s (dotAll — makes . match newline characters). Errors in your pattern are displayed immediately with a clear message, helping you iterate quickly without guessing what went wrong.

如何使用Regex Tester

  1. Type your regular expression pattern between the two slash delimiters in the pattern field.
  2. Toggle the g, i, m, or s flag buttons to enable global matching, case-insensitivity, multiline mode, or dotAll mode.
  3. Paste or type your test string in the large textarea below the pattern field.
  4. Matches are highlighted in the text immediately — different colours distinguish multiple matches.
  5. Check the match list below the highlighted text to see each match, its position, and any capture groups.
  6. Refine your pattern until it matches exactly what you need, then copy it to use in your code.

常见问题

Which regex flavour does this tool use?

This tool uses JavaScript's built-in RegExp engine (ECMAScript flavour). It supports most common features including lookaheads, lookbehinds, named capture groups, and Unicode — but not some PCRE-specific features like conditionals or atomic groups.

What does the g flag do?

The global (g) flag tells the engine to find all matches in the string instead of stopping after the first one. Without it, you'd only see the very first match.

How do I use capture groups?

Wrap part of your pattern in parentheses — for example (\d+) — to create a capture group. The matched text inside the group is shown separately in the Groups column of each match result.

Why does my pattern work here but not in my code?

Make sure you're applying the same flags in your code as you set here. Also note that in JavaScript string literals you need to double-escape backslashes (\\d instead of \d) when constructing a RegExp from a string.

What is the dotAll (s) flag?

By default, the dot (.) in a regex does not match newline characters. Enabling the s (dotAll) flag changes this so that . matches any character including \n and \r, which is useful for matching multi-line content.

Regex Tester 完全使用指南与免费在线工具

无需安装、完全免费、纯前端本地运行的高效 Regex Tester 工具

用于快速解决：实时测试正则表达式。。无需安装复杂软件，打开网页即可立即使用，极速且安全。

为什么选择 Metoolzy 的 Regex Tester？

  • 秒级即时响应: 极致性能优化，输入即可见结果。
  • 数据绝对安全: 纯浏览器本地计算，数据绝不上传服务器。
  • 完全免费使用: 无需注册登录，无任何隐形消费。

三步快速上手

  1. 打开 Metoolzy Regex Tester 工具页面。
  2. 在输入区粘贴或上传您的数据。
  3. 即时查看处理结果并点击复制或下载。

功能对比表

对比项 Metoolzy Regex Tester 普通在线工具 本地客户端软件
使用成本 永久免费 有次数限制或收费 需购买授权
隐私保护 纯本地内存运行 数据需上传云端 本地运行

适用人群与应用场景

  • 软件开发人员日常调试与数据转换
  • UI/UX 设计师资产处理
  • 运营与办公人员效率提升

常见问题解答 (FAQ)

处理的数据会被记录或保存吗？

绝不会。所有运算均在您的浏览器本地完成，没有任何数据回传。