Number Verifier custom settings

Hello. I've installed the Number Verifier (for Trados 2019). When checking the settings, there are some custom settings, such as "Alphanumeric custom separators", "Custom separators" for thousands separators and decimal separators (source/target).

I checked the Number Verifier help, but I cannot figure out what we can do using those custom settings and what we need to input for those settings appropriately.
Would you please tell me about the features as well as some examples (what we need to input in those settings)?
(I found out the regular expression cannot be used in those settings as we found other inquiry posted on the SDL Communty.)  

Regards,

Yasuhiko Yamazaki