refactoring; improved the regex-lambda tests
refactoring; improved the regex-lambda tests

cyber-dojo/runner_stateless,cyber-dojo/runner,cyber-dojo/runner,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless