Regular Expression for National ID Format that matches a single character that is either a whitespace or a digit (2024)

How to configure a Regular Expression (reg-ex) for National ID format that would match a single character that is either a whitespace or a digit

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1. The syntax used for "National ID format" should be "N" which represents a number.
2. The reg-ex should be[\s\d]{1} whichmatches a single character that is either a whitespace or a digit.

   Example:
   National ID Format: NN.N-NN
   Condition: where the 3rd N should either be awhitespace or a digit
   Reg-Ex:[\d]{2}.[\s\d]{1}-[\d]{2}