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这个工具能做什么
Build and test regex patterns with flags, highlighted matches, and capture group inspection.
Regex Tester highlights all matches in real time as you type your pattern.
Capture groups appear in a table below, and preset patterns let you start quickly.
这个工具适合解决什么问题
Test an email, slug, SKU, or identifier pattern against realistic sample text before copying it into code or form validation.
Use the match table to confirm that each group captures the exact token your parser, replacement, or extraction script expects.
Toggle global, case-insensitive, multiline, and dotAll flags to see how the same pattern changes across common JavaScript regex modes.
依赖结果前需要检查什么
- Performance and maximum practical input size depend on browser memory, device speed, and the structure of the input.
- Review the generated result before replacing or publishing an original file.
如果还需要校验、转换或复用结果，可以继续打开相近的浏览器本地工具。
如何使用
01使用场景
Test an email, slug, SKU, or identifier pattern against realistic sample text before copying it into code or form validation.
Use the match table to confirm that each group captures the exact token your parser, replacement, or extraction script expects.
Toggle global, case-insensitive, multiline, and dotAll flags to see how the same pattern changes across common JavaScript regex modes.
使用技巧
- 01Validate before copying
If the input parser reports an error, fix the source value first instead of copying a partial result into code, config, or documentation.
- 02Escape literal punctuation
Characters like ., ?, +, *, [, ], (, and ) have special regex meaning. Escape them with a backslash when you want to match the literal character.
- 03Keep secrets local
The tool runs in your browser, but you should still avoid pasting long-lived production secrets into any shared or screen-recorded session.
- 04Use anchors when you need the whole string
A pattern can match part of a value unless you anchor it. Add ^ at the start and $ at the end when a full field must match, such as a complete slug or ID.
常见问题
02What flags are supported?
g (global), i (case-insensitive), m (multiline), and s (dotAll).
How many matches does it find?
Up to 500 matches per test to keep the UI responsive.
Does it show named capture groups?
It shows numbered capture groups. Named groups are shown by their position.