DeveloperLocal processing
Regex Tester
Enter regex and test text for live match highlighting
Test Text
Match Highlight (4 matches)
Order #12345, amount 99.00, phone 13800138000
Match List
#1 at position 7
12345
#2 at position 21
99
#3 at position 24
00
#4 at position 34
13800138000
About This Tool
Regex Tester is a free online tool. Test regular expressions online All processing runs locally in your browser — files are never uploaded to any server, keeping your data private.
Use Cases
- Format JSON, YAML, TOML, SQL, and XML for API debugging
- Encoding, hashing, JWT decode, AES crypto, and security tasks
- Regex, JSONPath, IP, Cron, and other developer utilities
- Run locally — configs and secrets never leave your device
How to Use
- Step 1
Enter regex pattern and flags
- Step 2
Paste test text to match against
- Step 3
See live highlighted matches
- Step 4
View capture groups and error hints
Frequently Asked Questions
- Is Regex Tester free?
- Yes, completely free with no registration required and no usage limits.
- Are my files uploaded to a server?
- No. Regex Tester processes everything locally in your browser. Your data never leaves your device or gets uploaded to any server.
- Which browsers are supported?
- Chrome, Firefox, Safari, Edge, and other modern browsers. We recommend using the latest version for the best experience.
- How do I use Regex Tester?
- 1. Enter regex pattern and flags 2. Paste test text to match against 3. See live highlighted matches 4. View capture groups and error hints