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Regex Tester
What is Regex Tester?
A regex tester runs a regular expression against sample text and lists the matches with their positions. It helps you build and debug patterns used for searching and validating text.
How Regex Tester helps
- Shows matches instantly
- Helps debug patterns
- Safe place to experiment
How to use Regex Tester
- Paste or type what you want to check.
- Read the score and the pass or fail items.
- Fix anything that failed and check again.
Example
The pattern \d+ on “Order 123 and 45” finds 123 and 45.
Frequently asked questions
Which regex flavour is this?
JavaScript regular expressions in your browser.
What do flags like g and i mean?
g finds all matches, and i ignores case.
Is my text uploaded?
No. Testing happens in your browser.
Results are estimates and suggestions. Always review them before you use them.
Last updated October 7, 2026.