Formatters
Regex TesterOnline Developer Tool
Test JavaScript regular expressions with live match highlighting, flags (g, i, m, s, u), and match counts. Client-side only.
About Regex Tester
Test JavaScript regular expressions with live match highlighting, flags (g, i, m, s, u), and match counts. Client-side only. Runs entirely in your browser — no installation, no account required to try it.
Key Features
- regex tester
- regular expression
- javascript regex
- regex debug
- pattern match
- Runs in your browser — no install
- Free to use, always
How to Use Regex Tester
- 01
Open the tool
Click "Use Regex Tester Free" above — no download or account required.
- 02
Enter your data
Paste or type your input directly in the browser. Processing happens locally on your device.
- 03
Copy the result
Get your output instantly. Copy it, download it, or keep working in the same tab.
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