Regex Tester
Write, test, and debug regular expressions live.
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🔒 Processed locally — your data never leaves your device.
How to Use Regex Tester
- 1Open the Regex Tester tool on this page.
- 2Enter your input — paste text, upload a file, or fill in the required fields.
- 3Get instant results processed entirely in your browser.
- 4Copy the output or download your file with one click.
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Frequently Asked Questions
Is Regex Tester free?
Yes, completely free. No registration required.
Do my files get uploaded?
No. Regex Tester runs entirely in your browser. Nothing is sent to a server.
Is there a file size limit?
No artificial limits. Processing is limited only by your device's available memory.
Does Regex Tester work offline?
Yes, once the page is loaded, the tool works without an internet connection.