Checks if a value is a valid language range.
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 value to validate as a language range
true if the value matches the extended language range pattern
true
TagRange
Checks if a value is a valid language range.
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).