Error on regex of type /(\$.[^ \n]*)/ in changeMessage field

I have a pass the respects the schema outlined on the Apple Developer website and which I can successfully create with ./signpass -p <file> and also successfully verify with ./signpass -v <file>

Yet still when I try to generate this pass after following all the steps in the README I get this error when I try to generate the pass.

Error: Validation of pass type failed. Pass file is not a valid buffer or (more probabily) does not respect the schema. Refer to https://apple.co/2Nvshvn to build a correct pass.
    at readFile.then.passStructBuffer (~/node_modules/passkit-generator/src/pass.js:135:15)

This even happens with some of the Sample passes from the Apple website (Tutorial), e.g. the BoardingPass.pass.

I tried looking into the code but I can not determine at which step or part of the JSON file it fails and also the error message is not very specific. Is there any chance you know where this comes from or how I could fix this or determine where the error comes from?

[alexandercerutti]

Oh okay, now I got it. You are right.

I mean, for the second part, my doubt is: shouldn’t we uniform the way the package let to add placeholders? Like all with $ or none?

[alexander-san]

Exactly so the [A-Z] is the exactly one and the [A-Z0-9]* part is 0 or more which combined together gives the original 1 or more what we want.

Second part I am still not sure what your plans are sorry.