About Regex Test Case Builder

Regex Test Case Builder is an independent web utility that helps developers and QA engineers quickly generate edge-case strings and expected matches for testing regular expressions.

What You Can Do Here

Type a regex pattern, choose flags, and the tool instantly produces a focused set of test strings—including boundary cases, empty inputs, Unicode samples, and common pitfalls—along with clear pass/fail expectations. All processing happens locally in your browser, so your patterns and data never leave your machine.

Why It Exists

Writing a regex is only half the work; verifying it against the weird, real-world inputs that break assumptions is the hard part. This site was built to fill that gap with a straightforward, no-sign-up tool that lives at regex-test-case-builder.hub2.day and stays out of your way.

Contact

Questions or feedback? Reach out at hello@regex-test-case-builder.hub2.day.