Regex Test Case Runner

Run positive and negative examples against a JavaScript regular expression, inspect matches and captures, and export a reusable JSON fixture. Everything stays in your browser.

Expression and cases

Pattern (without slashes)

Flags

JavaScript flags: d, g, i, m, s, u, v, or y. Support depends on your browser.

Should match (one case per line)

Should not match (one case per line)

Limits: 500 pattern characters, 200 cases, 5,000 characters per case, and 100 matches per case. Blank lines are valid test cases only when the textarea contains exactly one blank line.

Results

Run the tests to see results.

Status	Expected	Test case and match details