Text & Writing
Find & Replace
Replace a word everywhere at once, or use a pattern to make bigger text edits without doing them by hand.
On your device
Free online tool · No signup
Regex Tester
Try a regular expression against real text and see its matches and captured groups as you edit.
- Live highlighted matches
- JavaScript regex flags
- Capture-group table
Works in your browser · Your files stay hereFree · No account · No daily task limit
Your regex tester is getting ready.
Enable JavaScript to use this tool. Processing takes place in your browser.
0 bytes of your file uploaded
Verified live in this browser: not a single network request has been made since watching began.
How to use Regex Tester
- Type a pattern and pick flags.
- Paste test text — matches highlight instantly.
- Inspect capture groups in the table below.
Privacy
This tool runs entirely in your browser. Your file is processed on your device and is not uploaded to a server. You do not have to take that on trust — the monitor directly beneath the tool reads your browser’s own record of every request this tab made while your file was open.
See the full network readoutKeep the good work going.
Developer Tools
JSON Formatter & Validator
Make a wall of JSON readable, check for syntax errors or minify it when you need a compact version.
On your device
Developer Tools
URL Encoder / Decoder
Make text safe to put in a URL, or turn a link full of %20 and other encoded characters back into readable text.
On your device