Regex Tester

Developer Tools

Test and debug regular expressions with real-time match highlighting, group capture display, and flag toggles (g, i, m, s, u). Reference cheat-sheet included.

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Frequently asked questions

The tester uses JavaScript's built-in RegExp engine, which conforms to the ECMAScript specification.

Enable the 'm' flag to make ^ and $ match the start and end of each line. Enable the 's' flag to make the dot (.) match newlines.

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Regex Tester

Frequently asked questions

Which regex flavour does this tool use?

How do I test multiline patterns?

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Regex Tester

Frequently asked questions

Which regex flavour does this tool use?

How do I test multiline patterns?

More Developer Tools

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JSON Validator

Base64 Encode / Decode

URL Encode / Decode