Development tool
Regex Tester
Test JavaScript regular expressions, inspect matching text, and review capture groups in your browser.
Your data is processed locally in your browser and is not sent to our server.
Result
Your result will appear here.
Highlighted matches
How to use Regex Tester
- Enter a JavaScript regular expression and flags.
- Paste test text to see matches and capturing groups.
Example
Pattern: \b[A-Z][a-z]+\b
Flags: g
Text: Hello from DevTools HubTechnical details
Uses JavaScript RegExp syntax and flags. Catastrophic backtracking patterns may block the browser; use trusted, bounded input.
Frequently asked questions
Does this use PCRE?
No. It uses the JavaScript regular expression engine and its supported flags.