Developer tool

Regex Tester

Test a JavaScript regular expression against sample text and inspect bounded matches.

Free browser tool

No Matrix computer needed

✓ No account or card

✓ Use the result right away

✓ Task-specific limits below

Workspace

Use regex tester

Runs in this browser tab

Your input48 / 100,000

Result

Your result will appear here. The input stays in this browser tab.

How to use it

Put a pattern on the first line and test text below it to see matching substrings.

Try this example

Matrix\s+OS
Matrix OS connects tools and agents.

What to check

Patterns run in a disposable worker with a short timeout; some advanced or costly patterns may be rejected.

Review the result before using it in a published page, application, or agent configuration.

Quick answers

Frequently asked questions

Can a costly regular expression freeze the page?

Patterns run in a disposable browser worker with a short deadline and bounded matches. A pattern that takes too long is stopped.

Which regular-expression syntax does the tester use?

It uses JavaScript regular expressions. Put the pattern on the first line and sample text below; the output lists up to 100 matches.

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