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Regex Tester
Test JavaScript regular expressions with live highlighting and fast visual feedback.
About the Regex Tester
Test regular expressions with live highlighting, match counts, and a simple examples panel. This helps developers debug patterns faster when working with validation, parsing, scraping, log inspection, and quick text searches.
Key Features
- Live match highlighting in the browser
- Supports common JavaScript regex flags
- Shows match count and positions
- Includes ready-made example patterns
- Useful for debugging input validation and text parsing
How to Use
- Enter your regular expression pattern.
- Set the flags you need such as g or i.
- Paste a test string into the text area.
- Review the highlighted matches and the match list.
Frequently Asked Questions
Which regex flavor does this use?
It uses the browser's JavaScript regular expression engine.
Why is the global flag added automatically?
The interface highlights all matches, so global matching is used to collect the full set of results.
Can I test multiline input?
Yes. Paste multiline content and use flags like m when needed.
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