bcp47_spec 
A subset of the BCP 47 spec: https://tools.ietf.org/html/bcp47
Installation
Add this line to your application's Gemfile:
gem 'bcp47_spec'And then execute:
$ bundle
Or install it yourself as:
$ gem install bcp47_spec
Usage
BCP47.valid?('de-Latn-DE-1996-u-attr-co-phonebk-t-und-cyrl-x-private-test') # truetag = BCP47.parse('de-Latn-DE-1996-u-attr-co-phonebk-t-und-cyrl-x-private-test')
tag.language # de
tag.script # Latn
tag.region # DE
tag.variant # [1996]
tag.extension # [['t', 'und-cyrl'], ['u', 'attr-co-phonebk']]
tag.private # ['private', 'test']BCP47.parse('blahblahblah') # raises InvalidLanguageTagTODO
- Parse private and grandfathered language tags (maybe?)
- Parse extensions T (https://tools.ietf.org/html/rfc6497) and U (https://tools.ietf.org/html/rfc6067)