Random String Generator from Regex Pattern
Generate random strings that match a regular expression (test data), in your browser.
Generates examples matching the pattern (via randexp). Perfect to create test data/fixtures.
🔒 100% client-side — no data sent
Generate random strings that match a given regular expression, perfect for creating realistic test data. Everything runs 100% in your browser: no data is sent to any server, so your privacy stays protected.
What is it for?
- ▸ Produce test datasets to validate forms and API endpoints
- ▸ Create sample matches to verify a regex before shipping it to production
- ▸ Seed a development database with fake IDs, codes or reference numbers
- ▸ Illustrate a tutorial or documentation with strings that fit a pattern
FAQ
Which regular expression syntaxes are supported?
The tool handles common JavaScript-style regex constructs: character classes, quantifiers, groups, alternations and anchors, covering the vast majority of test patterns.
Are my regular expressions sent anywhere?
No. Generation happens entirely locally in your browser; neither the regex nor the generated strings ever leave your machine.
Can I generate several strings at once?
Yes, you can request multiple matches at once to quickly build a varied dataset from the same pattern.