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Regex Tester
Test JavaScript regular expressions, flags and matched text in your browser.
✓ Free tool✓ No signup✓ Private in-browser workflow
01Add sourceYour data stays local
02ProcessUse focused settings
03Copy outputCopy or download
BEFORE YOU START
About Regex Tester
Test JavaScript regular expressions, flags and matched text in your browser. This tool operates locally in your browser and does not upload your work to RuvoKit servers.
Check the generated output before using it in a production website or an official document.
YOUR WORKFLOW
Quick guide
- Fill in the purpose-built input fields.
- Run the operation and review the result.
- Copy the text or download the generated output.
How to use Regex Tester
- Enter a JavaScript regular expression without surrounding slash characters.
- Set optional flags and paste sample text containing possible matches.
- Click Find matches, then inspect count, indices and captured matches.
What to know before you start
Complex regular expressions can be computationally expensive. Use small, non-sensitive test inputs.