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All ToolsRegex Tester
Regex Tester
Test and debug regular expressions. Highlights all matches and shows captured groups.
What is Regex Tester?
Regex Tester is a free online tool that tests regular expressions against sample text. Shows highlighted matches, match count, and captured groups. Supports all standard JavaScript regex flags.
How It Works
Enter your regex pattern, select flags, type your test string, then click Test. The tool constructs a JavaScript RegExp and uses matchAll() to find all matches, highlighting them in the result area.
Key Benefits
- Highlighted matches with yellow background
- Match count and captured groups displayed
- Supports g, i, m, and s flags
- Clear error messages for invalid regex patterns
- 100% client-side — no data sent to any server
Frequently Asked Questions
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