What this tool does
Enter a pattern and sample text to highlight matches, preview replacements, and inspect capture groups with selected inputs processed locally in your browser.
Privacy behavior
Selected file contents are processed locally in your browser for supported workflows. This privacy build does not intentionally load ads, analytics, remote fonts, or third-party runtime scripts.
Supported workflow
Regex testing helps validate form input, parse logs, inspect API text, and debug extraction rules before using them in code.
When should you test regex?
Regex testing helps validate form input, parse logs, inspect API text, and debug extraction rules before using them in code.
This tool uses native JavaScript RegExp behavior and renders user text as text, not HTML.
Frequently Asked Questions
Is this Regex Tester free?
Yes. You can test patterns and preview replacements without signup.
Is my text sent to ConvertUnlimited servers?
No server-side upload endpoint is used for testing; patterns and text are processed locally in your browser.
Which regex engine is used?
It uses the native JavaScript RegExp engine in your browser.
Are invalid regex patterns handled?
Yes. The tool shows a friendly warning and preserves your input.
Does it support Unicode regex?
Yes. Use the u flag for Unicode-aware patterns.
Privacy
Privacy build: This build removes ads, analytics, remote fonts, runtime CDN scripts, and file-operation telemetry. Selected files are processed in the browser using local JavaScript and browser APIs.
ConvertUnlimited does not provide a server-side upload endpoint for this regex testing flow. Patterns and test text are processed locally in your browser.
Terms of Use
ConvertUnlimited is provided as is. Test expressions carefully before using them in production systems.