Free Regex Tester
Test a JavaScript regular expression against your text with live highlighting, capture groups, named groups and replace. Runaway patterns are stopped after 1.5 seconds.
- Runs locally
- Write a pattern and flags
- Paste test text
- Inspect groups or replace
- Free
- No sign-up
- Runs in your browser
- No watermark
JavaScript (ECMAScript) syntax. Flags: g global, i ignore case, m multiline, s dotAll, u unicode, y sticky, d indices.
This tool runs in this browser tab and does not ask for an account. What you enter is not sent to PoYo.
Use cases
Where it helps
Quick answers
Open the page and get a result without installing an app.
Any computer
It works in a current browser on Windows, macOS, Linux or ChromeOS.
Nothing to clean up
Close the tab when you are done. PoYo keeps no copy.
Three steps
How to use Free Regex Tester
Write a pattern and flags
JavaScript regular expression syntax.
Paste test text
Matches are highlighted as you type.
Inspect groups or replace
See $1, named groups and the replaced text.
Features
What this tool includes
Runs locally
This tool runs in this browser tab and does not ask for an account. What you enter is not sent to PoYo.
Write a pattern and flags
JavaScript regular expression syntax.
Paste test text
Matches are highlighted as you type.
Inspect groups or replace
See $1, named groups and the replaced text.
PoYo
Need a new image or video?
These free tools work on files you already have. To create an image, video or audio from a description, open a PoYo generator.
Free Regex Tester FAQ
Do I need an account?
No. Open the page and use it.
Is what I enter sent anywhere?
This tool runs in this browser tab and does not ask for an account. What you enter is not sent to PoYo.
Does it cost anything?
No. It is free and does not use PoYo credits.
Can I use it on my phone?
Yes, in a current mobile browser. Tools that need a physical keyboard or mouse are easier on a computer.
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Test a JavaScript regular expression against your text with live highlighting, capture groups, named groups and replace. Runaway patterns are stopped after 1.5 seconds.