Regex Tester
Write and debug regular expressions with live match highlighting, flags and capture groups.
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Result 2 matches
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🔒 Tested on your device
How to test a regex
- Enter your pattern. And pick flags.
- Add a test string. Matches highlight instantly.
- Inspect matches. See each match and its groups.
Frequently asked questions
How does the regex tester work?
Type a pattern and test string, and matches are highlighted live as you type. It uses JavaScript's regular expression engine in your browser.
Which flags are supported?
Global (g), ignore case (i), multiline (m) and dotall (s). Toggle them with the buttons or type them directly.
Does it show capture groups?
Yes. Each match lists its captured groups so you can debug complex patterns quickly.
Is my data uploaded?
No. Everything runs locally in your browser.