Check if a value is a business identifier code

JavaScript version
const isBIC = (value) => /^[a-zA-Z]{6}[a-zA-Z0-9]{2}([a-zA-Z0-9]{3})?$/.test(value);
TypeScript version
const isBIC = (value: string): boolean => /^[a-zA-Z]{6}[a-zA-Z0-9]{2}([a-zA-Z0-9]{3})?$/.test(value);