Use unicode version instead of ruby version

Author: tom-lord

lib/regexp-examples/unicode_char_ranges.rb

@@ -11,8 +11,7 @@ class UnicodeCharRanges
  # These values were generated by: scripts/unicode_lister.rb
  # Note: Only the first 128 results are listed, for performance.
  # Also, some groups seem to have no matches (weird!)
- # (Don't care about ruby micro version number)
- STORE_FILENAME = "unicode_ranges_#{RUBY_VERSION[0..2]}.pstore".freeze
+ STORE_FILENAME = "unicode_ranges_#{RbConfig::CONFIG['UNICODE_VERSION']}.pstore".freeze
 
  attr_reader :range_store
 
@@ -30,10 +29,12 @@ def get(key)
 
  private
 
+ # The method is written like this to future-proof it a little,
+ # i.e. the gem won't completely break for a new ruby version release
  def unicode_ranges_file
  db_path = File.join(__dir__, '../../db')
  Dir["#{db_path}/*.pstore"].sort.select do |file|
- file <= "#{db_path}/unicode_ranges_#{RUBY_VERSION[0..2]}.pstore"
+ file <= "#{db_path}/#{STORE_FILENAME}"
  end.last
  end