NKJ
NKJ can judge given chars are included in JIS X 0213 or not.
Installation
Add this line to your application's Gemfile:
gem 'nkj'Or install it yourself as:
gem install nkj
Usage
require 'nkj'
# `jisx0213?` returns a boolean value whether or not the given all chars are included in JIS X 0213.
NKJ.jisx0213?('aあ!庵') #=> true
NKJ.jisx0213?('髙') #=> false
# `level1?` returns whether or not the given all chars are included Japanse Level1 Kanji.(第一水準)
NKJ.level1?('山') #=> true
# `level2?` returns whether or not the given all chars are included Japanse Level2 Kanji.(第二水準)
NKJ.level2?('丼') #=> true
# `level3?` returns whether or not the given all chars are included Japanse Level3 Kanji.(第三水準)
NKJ.level3?('﨑') #=> true
# `level4?` returns whether or not the given all chars are included Japanse Level4 Kanji.(第四水準)
NKJ.level4?('挻') #=> trueLicense
The gem is available as open source under the terms of the MIT License.
Special Thanks
NKJ uses "JIS X 0213 Code Mapping Tables" which created by Project X0213. https://x0213.org/codetable/index.en.html