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Regex Tester
Live regex testing with match highlighting, groups, and replace preview
//g
Flags:
No matches
Test String
Highlighted Matches
Matches highlighted here…
Replace preview…
Comprehensive Tool Overview
Everything You Need to Know About Regex Tester
Test regular expressions in real time with syntax highlighting, flags, and match groups. Free developer tool by Pasha Dev.
100% Free: No subscription or credit card
Privacy First: Zero logs & auto-purged files
Cross-Platform: Works on iOS, Android & PC
Easy Tutorial
How to Use Regex Tester in 3 Steps
Follow this quick walkthrough to get optimal results in seconds.
1
Enter Pattern & Flags
Input your regular expression (e.g. [a-z0-9]+) and toggle flags (g, i, m).
2
Provide Test String
Enter the text you want to evaluate.
3
Inspect Matches
View highlighted matches and captured groups in real time.
Engineered for Quality
Key Features & Benefits
Live Matching
Instant visual highlights as you type.
Cloudflare R2 Temporary Storage
Files are processed securely and deleted automatically upon download. No permanent logs or storage.
100% Free & Limitless
No subscription fees, no account registrations, and no artificial throttles.
Technical Specifications & Compatibility
EngineECMAScript (JavaScript Regex)
Got Questions?
Frequently Asked Questions
It uses the ECMAScript (JavaScript) regular expression engine native to your browser.
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