| ^CMake Error at .*/Modules/ExternalData.cmake:[0-9]+ \(message\): | |
| Bad ExternalDataCustomScript key '0BadKey' in URL template: | |
| ExternalDataCustomScript://0BadKey/%\(algo\)/%\(hash\) | |
| The key must be a valid C identifier. | |
| Call Stack \(most recent call first\): | |
| BadCustom1.cmake:[0-9]+ \(ExternalData_Add_Target\) | |
| CMakeLists.txt:[0-9]+ \(include\)$ |