Regex Tester
Try a regular expression pattern against your own text and see every match highlighted.
The Regex Tester applies a regular expression to a piece of text and shows every match, using the browser's native regular expression engine.
Your files are processed locally in your browser and are not uploaded.
How to use Regex Tester
- 1
Enter the pattern
The regular expression.
- 2
Enter flags
Optional — matching all occurrences is already applied automatically.
- 3
Paste the test text
- 4
See the matches found
Testing before using it in code
Writing a regular expression directly in code makes every tweak slower — you have to save, run and check the result each time. Testing the pattern on its own, against real sample text, makes that loop much faster.
When should you use this tool?
Developers
Validate a regex pattern before using it in code.
Data extraction
Check whether a pattern correctly matches the desired parts of a text.
Form validation
Test a validation rule (email, zip code, phone) against real examples.
Frequently asked questions
- Which regex flavor does this use?
- It uses your browser's native JavaScript regular expression engine.