@rjc123 to make this case insensitive would mean doing something like this:
`source.url =~ /(fabricatedurl|placeholderunique|github)/i`

Short term, we need to exclude these things as they will add nonsense mappings to Transition.

@bradleywright is correct, we shouldn't be having to do this. I *think* Whitehall should allow documents to be bulk imported without an Old URL.