Regex Tester guide
Open Regex TesterFind matches with JavaScript regular expressions.
How to use Regex Tester
Find pattern matches in a test string.
- Select Load example or paste your own test input.
- Choose Test and review the available options.
- Run the selected action; review any validation message.
- Inspect the output before copying, printing or downloading it.
A small example
Pattern \d+ on x12 y34 → matches 12 and 34
When the result looks wrong
JavaScript syntax is used; other languages may differ. Excessively expensive patterns can time out.
Questions about Regex Tester
Is my input uploaded?
File and text processing runs in your browser. Opening the website still loads application assets from its host.
What if the result looks wrong?
JavaScript syntax is used; other languages may differ. Excessively expensive patterns can time out.
Can I use sensitive production data?
Prefer non-sensitive test data. Never paste live access tokens, passwords or confidential documents into a site without assessing its code and environment.