Redwood - National Identifier Validation

Current Situation:
We need to validate the National Identifier field as per below requirement. At present, if the entered National Identifier is not in the correct format, the system displays a warning but still allows the record to be saved.

Requirement: Must be specific number of digits based on country code.
Norway 11-digits
Denmark: 10-digits
Sweden: 10 -12digits
Poland: 11-digits
UK: No validation, other format
Norge & Svalbard (NO/SJ): +47 + 8 numbers
Denmark (DK): +45 + 8 numbers
Sweden (SE): +46 + 7–9 numbers
Poland (PL): +48 + 9 numbers

Attempted Solution:

We tried using an EL expression in Express Mode to validate the field, but this approach did not meet the requirement.