Regex Tester & Matcher
Interactive JavaScript regular expression tester. Live visual match highlighting, capture group inspectors, flag toggles, and substitution preview.
Test String
2 MatchesMatch Information & Groups
| # | Match | Index | Capture Groups |
|---|---|---|---|
| 1 | [email protected] | 27 | None |
| 2 | [email protected] | 52 | None |
Substitution & Replacement Preview
Hello world! Contact us at [[email protected]] or [[email protected]]. Our website is https://2clickkit.app and backup server IP is 192.168.1.1. Release date: 2026-10-16. Brand color code is #2563EB.
How to Use Regex Tester & Matcher
-
Enter your regular expression
Type your regex pattern and toggle matching flags (global, case-insensitive, multiline, or dotAll).
-
Input or paste test text
Paste code, logs, or text into the test area. All matches highlight in real time.
-
Inspect matches and capture groups
Browse individual matched substrings, starting character indices, and indexed capture groups ($1, $2).
Email Extraction Regex Example
Pattern: [\w.-]+@[\w.-]+\.[a-z]{2,} | Text: "Hello [email protected]"Match 1: "[email protected]" at index 6Highlights matches on keystroke with zero network latency.
Technical Specifications
- Supported Inputs: JavaScript RegExp, Capture Groups ($1, $2), Flags (g, i, m, s)
- Input Limit: Unlimited client-side computation
- Processing Engine: 100% In-Browser (ECMAScript RegExp Engine)
- Content Uploads: None (Your files and text are processed locally on your device with zero uploads)
Privacy & Security Guarantee
Your regex patterns and text are processed entirely in your web browser's memory using native client-side web technologies. Unlike traditional cloud tools, your content is never uploaded to remote servers, stored on external disks, or analyzed by third parties.
2ClickKit In-Browser vs Traditional Cloud Tools
| Feature | 2ClickKit (In-Browser) | Traditional Cloud Services |
|---|---|---|
| Data Privacy | Files never leave your local device | Uploaded to remote servers and third-party clouds |
| Processing Speed | Instant local execution (0ms upload time) | Constrained by internet upload & server processing queues |
| Account & Costs | 100% Free with zero registration or paywalls | Tiered subscriptions, limits, or forced sign-ups |
Best Practices & Tips
- Click any of the common presets (Email, URL, IPv4, Hex Color) to quickly load tested production-ready patterns.
- Need to inspect JSON Web Tokens? Check out our JWT Decoder tool.
Frequently Asked Questions
Which regular expression engine is used?
The tester uses your web browser’s native ECMAScript JavaScript RegExp engine, ensuring 100% compatibility with client-side JavaScript, TypeScript, Node.js, and web frameworks.
What do the regex flags mean?
g (global) finds all matches rather than stopping at the first; i (case-insensitive) matches uppercase and lowercase equally; m (multiline) treats ^ and $ as beginning/end of line; s (dotAll) allows . to match newline characters.
Can I test string replacement with capture groups?
Yes! Use the Substitution section below the test string to test replace patterns using $& (full match), $1, $2, etc.
Are my confidential test strings or tokens uploaded to any server?
No! 100% of regex evaluation runs locally in client-side memory. Zero strings or patterns are ever uploaded.