Test Regular Expressions Online
Regex is powerful but unforgiving. Testing patterns live — with immediate feedback on matches and captured groups — is far faster than the trial-and-error of running code each time.
Features you need in a regex tester
- Live highlighting — see matches update as you type
- Flag toggles — g (global), i (case-insensitive), m (multiline), s (dotAll)
- Captured group display — see group 1, group 2 separately
- Match position — character index of each match
- Multiple test strings — paste real data to validate
Common patterns quick reference
- Email: ^[\w.-]+@[\w.-]+\.[a-z]{2,}$
- URL: https?:\/\/[\w.-]+
- Phone (US): ^\+?1?[-.\s]?\(?[0-9]{3}\)?[-.\s]?[0-9]{3}[-.\s]?[0-9]{4}$
- Digits only: ^\d+$
- Alphanumeric: ^[a-zA-Z0-9]+$
Frequently Asked Questions
Which regex flavour does Irreva use?
JavaScript's built-in RegExp engine — the same as your browser and Node.js runtime.
Can I test multiline strings?
Yes — paste multiple lines into the test string field and use the m flag for multiline matching.