Regex Tester
Test regular expressions against sample text and see matches highlighted.
✅ 100% Free
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⚡ Instant Results
What is a Regex Tester?
A regex tester lets you try a regular expression against input text and see which parts match.
How to Use This Regex Tester
- Enter your regex pattern.
- Enter the flags (g, i, m, s, u, y).
- Enter the test text.
- See matches highlighted live.
How It Works
The tool compiles the pattern with JavaScript's RegExp and runs it against the input.
Example Calculation
Pattern "\d+" on "abc123def456" matches "123" and "456".
Frequently Asked Questions
Which regex flavour is supported?
JavaScript (ECMAScript) regular expressions.
Privacy & Data Processing
All processing happens in your browser.
Last updated: 2026-10-01