How to customize the validations for Bank Account Number for country specific requirements

We have a requirement for Australia, New Zealand and Mexico to customize the validation logic for Bank Account number

For example -

1. for Australia current validation in Oracle for Bank Account Number is 10 characters whereas the requirement is to change the validation to "Bank account not be more than 34 alphanumeric characters"

2. for New Zealand current validation in Oracle for Bank Account Number is 8 characters whereas the requirement is to change the validation to "Bank account not be more than 10 characters"

3. for New Zealand current validation in Oracle for BSB is 4 characters whereas the requirement is to change the validation to "BSB not be more than 6 characters"