Validation

IBAN (International Bank Account Number)

Validate IBAN bank account identifiers: 2-letter country code, 2 check digits, 11–30 alphanumerics.

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Available in

JSSupported

JavaScript / ECMAScript

Browser-native RegExp. Default if you don't pick.

PYSupported

Python (re)

CPython stdlib `re`. Unicode-aware `\w` and `\d` by default.

GOSupported

Go (RE2)

Linear-time matching. No backreferences or lookarounds.

Pattern

regexengine-agnostic
^[A-Z]{2}\d{2}[A-Z0-9]{11,30}$

Raw source: ^[A-Z]{2}\d{2}[A-Z0-9]{11,30}$

How it works

^[A-Z]{2} matches the ISO country prefix (e.g. DE, GB, FR). \d{2} matches the two-digit check sum. [A-Z0-9]{11,30}$ matches the remaining bank/account portion which varies by country between 11 and 30 characters. This validates structure but does NOT verify the mod-97 checksum — pair with a checksum function for full validation.

Examples

Input

GB29NWBK60161331926819

Matches

  • GB29NWBK60161331926819

Input

DE89370400440532013000

Matches

  • DE89370400440532013000

Input

1234567890

No match

—

Common use cases

  • •SEPA payment form validation
  • •International invoice processing
  • •KYC and onboarding flows
  • •Payment file (XML/CSV) ingestion pipelines
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