`*` wildcard catches only 1-n not 0-n characters

[TobiasNx]

See example:

https://metafacture.org/playground/?flux=%22https%3A//raw.githubusercontent.com/metafacture/metafacture-core/master/metafacture-runner/src/main/dist/examples/read/pica/10.pica%22%0A%7C+open-http%0A%7C+as-lines%0A%7C+decode-pica%0A%7Cfix%28transformationFile%29%0A%7Cencode-yaml%0A%7Cprint%0A%3B&transformation=retain%28%22041A%2A%22%29%0A%0A%23+retain%28%22041A%2A%22%2C%22041A%22%29%0A

retain("041A*")

does not catch 041A, need to use

retain("041A*","041A")

for that.

[blackwinter]

So sorry! Accidentally pushed to master instead of dedicated branch...

Functional review: @TobiasNx
Code review: @dr0i

NOTE: This is not a Metafix issue, removing the label.