You can define a custom comparator in the plugins.properties file. This is now done by providing a configuration to the SetUp constructor.

!| script |
| given page | TestPage | with content | ${SUT_PATH} !-
!define TEST_SYSTEM {slim}
| scenario | test in scenario |
| check | echo | test | glob:t*t |

!| script | fitnesse.fixtures.EchoFixture |
| check | echo | test | glob:t*t |
| test in scenario |
-! |
| test results for page | TestPage | should contain | t*t matches test |
| ensure | content contains | 2 right, 0 wrong, 0 ignored, 0 exceptions |