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.

Presets:

Regex Pattern

4/4 passed4/5 test strings

✓MATCH

✓NO MATCH

ProExport test results as CSV — unlimited test strings

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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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