Person Number length check Validaiton

Summary:

Validate the Person Number Length

Content (please ensure you mask any confidential information):

Dear All,

Our client is using manual person number creation as they want to follow fixed prefixes based on worker category and other employment related details.

Example: If Worker Category = A then person number should start with F followed by 6digits.

If worker category = B, then Person Number should start with RA followed by 6 digits.

We have achieved the requirement to validate the Person Number prefixes based on worker category, but validation for 6digit length is not working.

Can someone please guide, how can we put a validation on person number that 6digit length validation to be checked after prefix.