Regex Tester
Test your regex against multiple strings simultaneously. Define expected match / no-match assertions and see instant pass/fail results — perfect for validating patterns. Presets for email, URL, IPv4, and phone. Pro: unlimited test strings + CSV export.
Frequently Asked Questions
How do I test a regular expression online?▼
Paste your regex pattern in the top field, then add test strings below. The tool instantly shows which strings match and which don't. Use the built-in presets for common patterns like email, URL, or IPv4.
What regex flavor does this tester use?▼
This tool uses JavaScript's built-in RegExp engine, which supports standard regex syntax including lookahead, lookbehind (ES2018+), named capture groups, and Unicode property escapes.
Is my data safe when using this regex tester?▼
Yes. Everything runs 100% in your browser using JavaScript. No data is ever sent to any server. Your patterns and test strings never leave your machine.
Can I test regex against multiple strings at once?▼
Yes. Add multiple test strings and mark each as 'should match' or 'should not match'. The tool shows pass/fail results for all strings simultaneously — great for building reliable validation patterns.
What is the difference between match and test in regex?▼
In JavaScript, test() returns true/false for whether a pattern matches, while match() returns the actual matched substrings. This tool uses both — showing pass/fail status plus the matched portions of each string.
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