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Free Online Regex Tester
Test regular expressions against sample text. Toggle flags, see matches with capture groups, and highlighted results. Runs entirely in your browser.
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Frequently Asked Questions
- What regex flags are supported?
- Global (g), ignore case (i), multiline (m), dotall (s), unicode (u), and sticky (y) — matching JavaScript RegExp flags.
- Can I see capture groups?
- Yes. Each match shows numbered capture groups from parentheses in your pattern.
- Does this work for Python or Java regex?
- This tester uses JavaScript RegExp syntax. Most basic patterns are portable, but lookaheads and Unicode features may differ across languages.
- Is my data sent to a server?
- No. All matching runs entirely in your browser.