Free Online Regex Tester
Test ordinary JavaScript regular expressions against sample text. Avoid untrusted or pathological patterns that can consume excessive time.
All processing happens locally in your browser.
Avoid untrusted or pathological regular expressions.
Private: your files are processed in your browser and are never uploaded to our server.
How to use
- Enter a regular expression and flags.
- Paste test text.
- Run the test to inspect matches.
Regex Tester
Test ordinary JavaScript regular expressions against sample text. Avoid untrusted or pathological patterns that can consume excessive time.
This tool runs in your browser and does not upload your input to SindhTools. Review output before using it.
Frequently asked questions
Which regex syntax is supported?
The tool uses JavaScript RegExp syntax.
Can complex expressions freeze the page?
Some pathological patterns can be slow. Use only trusted, ordinary patterns and moderate input.