Regex Replace Playground
Test regex replacements with capture groups before using them elsewhere.
Test regex replacements safely
A find-and-replace with capture groups can transform text elegantly — or wreck it if the pattern is slightly off. This playground lets you test a regex replacement, including $1-style group references, against sample text before you run it for real.
Previewing the result catches greedy matches and group mistakes before they touch your files or database. Enter a pattern, a replacement, and some text, and confirm the transformation does exactly what you intend.
Private and instant
Everything runs locally in your browser using standard web APIs — nothing is uploaded, logged, or stored on any server — so the tool works offline, responds instantly, and keeps whatever you paste in on your own device. That makes it safe to use even for confidential, client, or internal data you would never send to an unknown website.
Frequently Asked Questions
What does the regex replace playground do?
It processes pasted developer text in your browser and writes a usable result to the output panel.
Does this send code or data to a server?
No. The tool runs client-side in your browser and does not upload your input.
What are the limits?
It is designed for everyday snippets, configuration values, and small files rather than huge production datasets.
Is this free?
Yes. It is a free browser utility with no account required.
Practical utilities for everyday web development work.