ToolPronto
Test a regular expression safely
Check matches and replacement output without sending your text to a server.
Test a JavaScript regular expression
What this tool does
Test JavaScript regular expressions, inspect matches, and preview replacements in your browser. Check matches and replacement output without sending your text to a server. Work runs in a disposable worker with strict size and time limits. No tester can make every regular expression safe.
Useful for
- Enter a JavaScript pattern and flags.
- Paste bounded test text.
- Inspect matches or preview a replacement.
How to use it
- Enter a JavaScript pattern and flags.
- Paste bounded test text.
- Inspect matches or preview a replacement.