Test Your Regular Expressions Instantly
For developers, testers, and text processors who need to validate regex patterns against sample text. See matches, capture groups, and positions in real-time to debug and refine your patterns.
Results update live as you type — no button needed. The Example button fills a sample input.
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Why use Regex Tester?
Instant match results with highlighted positions
Capture group details for complex patterns
User-friendly interface for quick testing
Supports all major regex flavors
Free and no sign-up required
FAQ
What regex flavors are supported?
Our tester supports JavaScript-compatible regex syntax, which is similar to most modern languages. For advanced features, check compatibility.
Can I see capture groups?
Yes, the tool displays all capture groups for each match, making it easy to debug complex patterns.
Is my data safe?
Absolutely. All processing is done in your browser; no data is sent to any server.
Do I need to escape special characters?
Yes, you should escape special characters as you would in your code. The tool will treat the input as a raw regex pattern.
Example input
Try it with this sample — paste it into the box above:
\b\w+@\w+\.\w+\b
How to use Regex Tester
- Enter or paste your data into the Enter your regex pattern box above.
- The result appears instantly in the Matching results box — everything runs in your browser, nothing is uploaded.
- Use Copy or Download to keep the result, or Example to load a sample first.
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