Regex Tester & Match Debugger
Test regular expressions with real-time match highlighting, regex flag toggles, and group extractions offline.
Match Preview & Highlights:
0 Matches Found| Match # | Full Match | Index | Groups |
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How to Use Regex Tester
Enter Regex Pattern
Type your regular expression (e.g. ([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})).
Toggle Regex Flags
Select flags: g (global), i (case insensitive), m (multiline), s (dotAll).
Inspect Match Results
Review live match highlights and capture group breakdown.
Key Features & Capabilities
- Live real-time match highlighting
- Regex flags toggling (g, i, m, s, u, y)
- Capture group extraction & match index table
- 100% private in-browser execution
100% Client-Side Privacy: All operations occur locally in your web browser memory using JavaScript and WebAssembly. Your files, text payloads, and images are never uploaded to external servers or stored in cloud databases.
Frequently Asked Questions
View All Platform FAQsIs Regex evaluation client-side?
Yes. Regular Expressions run 100% inside your web browser JS engine.
Are regex capture groups supported?
Yes. All matched groups and group indexes are extracted and displayed.
Experiencing an issue with Regex Tester?
Notice a bug, calculation error, or unexpected result? Let us know.