[ 2440283 ] Key pattern is empty

[HolQue]

We should clarify how to deal with:

keyPattern = ""

Like also

keyPattern = r'.*'

this allows empty key names

"" : 2

But this makes no sense. And empty names cannot be referenced.

For sure this is nonsense:

"" : 2,
"param" : ${}

Result:

Error: 'Invalid key name: ${}. A pair of curly brackets is empty!!!'!

I propose to let the JsonPreprocessor raise an exception in case of a user defines a regular expression that would accept empty strings.

[namsonx]

Hello Holger,

I pushed the change to stabi branch, the error message in this case now is:

Exception: The key pattern '.*' allows key names that are empty or contains only whitespace!

Thank you,
Son

[HolQue]

Retest successful. Issue can be closed.

Addendum:

There are much more expressions possible than '.*' to match empty strings. But this is handled in #428