How to exclude files from search path?

I use

`i18n.set('filename_format', 'translations.{format}') `

to load `translations.yml` and that works fine.

However, I would like to exclude `synonyms.yml` from the load path because I use that file for a different purpose.

=> How to do so?

I tried to use negative look ahead regular expression

'^(?!synonyms)translations.{format}'

but that did not work.