Regex Test Case Runner

Define test cases with + and - expectations and see pass/fail results for a pattern and flags in a protected browser worker.

Pattern

Flags

Cases: + should match, - should not match

ReadyEach case is tested independently with RegExp.lastIndex reset before the next case.

How to use this Regex Test Case Runner

Run should-match and should-not-match cases against one regular expression. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.