Regex Tester
Test a JavaScript regular expression against sample text and inspect bounded matches.
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Workspace
Use regex tester
Runs in this browser tab
Result
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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