Regular Expression (Regex) Tester
Test JavaScript regular expressions in real-time with syntax highlighting, flag toggles, and match groups.
100% Local Processing: All calculations and conversions run entirely inside your browser. No private data is ever uploaded or recorded.
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How to Use Regular Expression (Regex) Tester
1
Enter Your Input
Paste, upload, or type your input directly into the editor or controls above.
2
Instant Processing
Computed 100% locally in your browser with fast execution and complete privacy guarantee.
3
Copy or Download
Quickly copy the processed output to your clipboard or download files with one click.
Technical Specifications & Standards
Architecture Client-Side Web Crypto / V8
Data Privacy 100% In-Browser (Zero Transfer)
Compliance W3C / RFC Standards
Availability Free Forever (Client-Side)
Frequently Asked Questions
Which flags can I toggle?
Global (g), Case-insensitive (i), Multiline (m), and DotAll (s).