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Regular Expression Tester

Run a JavaScript regular expression against sample text, review match positions and test flags without opening a console.

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FIELD NOTES

Testing regex safely

Regular expressions match text using literals, character classes, groups and quantifiers. Flags change behavior such as case sensitivity and global matching.

Complex nested quantifiers can cause slow backtracking. Test patterns against long and adversarial inputs before production use.

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Encode Unicode text to Base64 or decode it back safely.

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Generate one or many cryptographically random UUID v4 values.

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REFERENCE

Common questions

Which regex flavor does this use?

JavaScript RegExp syntax supported by your current browser.

Does this tool upload my input?

No. Processing uses browser APIs and the input is not sent to our server.