Function validate

validate(
code: "GB_NINO" | "GB_UTR" | "GB_VAT" | "GB_NHS" | ShortCode,
input: string,
): boolean
Validate a UK (GB) identity, tax, VAT or NHS document.
Parameters
- code: "GB_NINO" | "GB_UTR" | "GB_VAT" | "GB_NHS" | ShortCode
  Document type, either fully-qualified (GB_NINO, GB_UTR, GB_VAT, GB_NHS) or short (NINO, UTR, VAT, NHS).
- input: string
  Raw document string (formatting tolerated).
Returns boolean
true if the value passes GB-specific validation rules.
Example
```
import { validate } from "nationid/gb";
validate("GB_NINO", "QQ 12 34 56 C"); // true
validate("VAT", "GB 123 4567 89");
```
- Defined in countries/gb/index.ts:40