I need to validate that the country code and the rest of the IBAN align structurally, not just that it looks plausible.

This feature validates that an IBAN’s country code matches the required structure for that country, not just that the string appears plausible. It helps prevent accepting IBANs that pass basic checks but are incorrectly formatted for the specified country.

This feature performs structural IBAN validation using the country code as the authoritative context for the rest of the IBAN. Instead of relying only on general plausibility checks (such as length or character set), it verifies that the IBAN format aligns with the country-specific structure. This includes confirming that the overall length is correct for the given country and that each segment appears in the expected position and pattern. The goal is to detect mismatches where the country code is valid but the remaining characters do not conform to that country’s IBAN specification. The validation can be used at data entry time to provide immediate feedback and reduce downstream payment failures. It is also useful for batch validation of stored bank details to identify records that may be syntactically incorrect for their stated country. By enforcing country-structure alignment, the feature improves data quality and reduces operational friction caused by rejected payments. It supports use cases such as onboarding forms, payout setup, invoicing systems, and compliance-oriented validation workflows.