Creates a validated language range from a string.
Validates extended language ranges according to RFC 4647 § 2.2. An extended language range allows * as a wildcard for any subtag (e.g., en-*, *-CH).
*
en-*
*-CH
The string to convert to a language range
The validated language range
RangeError If the value is not a valid language range
Creates a validated language range from a string.
Validates extended language ranges according to RFC 4647 § 2.2. An extended language range allows
*as a wildcard for any subtag (e.g.,en-*,*-CH).