Regex Tester & Matcher
Test regular expressions with live match highlighting, flags, and group details.
| # | Index | Match | Capture Groups |
|---|---|---|---|
| 1 | 19 | hello@example.com | None |
| 2 | 40 | sales@acme.co | None |
How to Use Regex Tester & Matcher
- 1
Input Text
Paste or enter your content directly into the Regex Tester & Matcher input area.
- 2
Select Settings
Choose transformation options or conversion parameters with live updates.
- 3
Copy or Export
Copy the processed output to your clipboard or download it instantly.
About Regex Tester & Matcher
Test regular expressions online with live match visual highlighting, regex flags support, and capture groups. This tool operates completely in your web browser. No text inputs are ever sent to remote servers or stored in any database, ensuring 100% data privacy for code, API payloads, or confidential documents.
Client-Side Privacy Guarantee
All text transformations run inside your browser tab. Zero server logging or tracking.
100% Private & Offline Capable
Executes locally via JavaScript. Your text never leaves your device.
Instant Real-Time Results
No network latency or server waits. See outputs instantly as you type.
Frequently Asked Questions
Which flags are supported?
Supports g, i, m, s, u, and y flags.
Is this Regex Tester & Matcher safe and private to use?
Yes. All processing happens 100% locally on your computer inside your web browser using client-side JavaScript. Your files and data are never sent to any external server.
Do I need to create an account or pay to use this tool?
No. All 60 tools on NS Ascertain Toolkit are completely free with no registration, no subscription, and no usage limits.
Does this tool work on mobile devices and Macs?
Yes. The tool runs on any modern browser including Chrome, Safari, Firefox, and Edge across Windows, macOS, iOS, and Android.