Function getRegionCodeForNumber

getRegionCodeForNumber(
input: string | ParsedPhoneNumber,
options?: ParseOptions,
): Promise<string | undefined>
Gets the region code (ISO 3166-1 alpha-2) for a phone number.
Parameters
- input: string | ParsedPhoneNumber
  The phone number string or ParsedPhoneNumber
- options: ParseOptions = {}
  Parsing options including default region
Returns Promise<string | undefined>
The region code (e.g., "DE", "US") or undefined if unknown
Example
```
await getRegionCodeForNumber("+49 170 1234567")  // "DE"
await getRegionCodeForNumber("+1 650 253 0000")  // "US"
await getRegionCodeForNumber("+44 7911 123456")  // "GB"
```
- Defined in region.ts:25