Regex Tester
Test a regular expression against your text, with groups and a replace preview.
The pattern and the text stay in your browser.
Careful with nested quantifiers like (a+)+$ — JavaScript regex cannot be interrupted, so a bad pattern can freeze the tab.
How it works
This utility runs locally in your browser for privacy and speed.
1 ⚡
Unlimited local toolsThis run costs 1 credit(s) and is saved to your history automatically.
Log in to save and view your usage history.
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Frequently asked questions
- Do I get free credits to try Regex Tester?
- Yes — new accounts get 5 free credits to spend on any tool, Regex Tester included. After that you only pay for what you run.
- How many credits does Regex Tester cost?
- Everything runs in your browser and nothing is uploaded: free accounts pay 1 credit per run, and Pro or Pro+ members run it as often as they like.
- Is the content I paste private?
- Regex Tester uses your input only to generate the result. Stored results are deleted automatically by our retention policy, and you can remove any run from your history.
- Do I need to install anything?
- No. Regex Tester works in any modern browser — nothing to download or install.
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