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Regex Tester
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Regex Tester — Test Regular Expressions Online Free
What is Regex Tester?
Test regular expressions. First line: regex pattern. Remaining lines: text to test. Shows all matches.
Paste a regex on the first line and sample text below. See all matches and groups. Client-side only.
How to Use Regex Tester
- Paste or type your input into the editor on the left panel.
- Results update automatically while you type. You can also press Ctrl+Enter to force a refresh.
- View the result in the output panel on the right with full syntax highlighting.
- Use Copy or Download to export the result.
- Drag and drop
.jsonor.txtfiles directly into the editor.
Example
Input:
/\w+/g Hello world 123
Output:
Match: "Hello" at index 0...
Common Use Cases
- Validate patterns
- Extract matches
- Learn regex
Common Errors
Why Use Our Regex Tester?
- 100% client-side — your data never leaves your browser. No server processing, no data collection.
- No sign-up required — start using the tool instantly with no registration or installation.
- Keyboard shortcuts — press Ctrl+Enter to run, ? for shortcuts list, Ctrl+B to toggle sidebar.
- Persistent state — your input is automatically saved across sessions using local storage.
- IDE-style interface — Monaco Editor (the engine behind VS Code) with syntax highlighting and error detection.
- Multi-format conversion — convert between JSON, XML, CSV, and YAML without switching tools.
Frequently Asked Questions
How do I use it?
First line: your regex (e.g. \d+ or /pattern/g). Next lines: text to search.
Try Regex Tester Now
Paste your data into the editor above for instant processing. Use Ctrl+Enter anytime to re-run quickly.
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