Regular expression tester
Inspect JavaScript regular-expression matches and captures.
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Before you start
Complex patterns may stop at the time limit.
Frequently asked questions
Will a pattern behave the same in another language?
This tool uses JavaScript regular expressions. Other engines may use different syntax and matching rules. The g flag finds multiple matches and i ignores case. The email example is not complete address validation.
Is my file or input sent to a server?
No. Processing stays in your current browser session.