Does the regex tester upload my text?
No. Pattern testing runs locally in your browser.
Developer
Regex Tester
Enter a regex pattern, choose flags and inspect matches locally without sending text anywhere.
✓ Tool inputs are processed in your browser✓ No account
Test regular expressions locally.
When to use this tool
Use it when you need a quick local regex check before cleaning text, validating examples or documenting a pattern.
- Test email, ID or URL patterns on sample text.
- Check match indexes before using a regex in code.
- Share a small regex example without uploading private text.
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FAQ
Questions
Questions
Which flags are supported?
This MVP supports g, i and m flags with clear match count output.
How does it avoid freezing on risky patterns?
It limits input length, caps rendered matches and blocks obvious nested quantifier patterns.