Regex Tester v1.0
Test and debug regular expressions with real-time matching. See matches highlighted as you type.
No data uploaded – runs 100% in your browser
Used by developers in 120+ countries
v1.0 • Updated Nov 2025
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How to Use the Regex Tester
- Enter your regex pattern
- Paste your test string
- View matches highlighted in real-time
- Adjust flags as needed
What is Regex Tester?
A regex tester allows you to write and test regular expression patterns against sample text. It highlights matches and shows capture groups for debugging.
Why Use a Regex Tester?
- Real-time match highlighting
- Test before implementing
- Debug complex patterns
- View capture groups
- Support for all flags
Frequently Asked Questions
What is a Regex Tester?
A Regex Tester lets you write and test regular expressions against sample text with real-time highlighting.
Is this Regex Tester free?
Yes, this Regex Tester is completely free and runs entirely in your browser.
Is my data secure?
All processing is done locally in your browser. No data is uploaded or stored.