unicode_regex_digits.rb

latin = "6"
egypt = [0x0666].pack('U') # Arabic-Indic 6 - ٦
china = [0x516d].pack('U') #  六
braille = [0x2820].pack('U')

chars = [latin, egypt, china, braille ]
patterns = [ /\d/, /[[:digit:]]/, /[[:alnum:]]/]

chars.each do |char|
  puts "  #{char}.to_i = #{char.to_i}"
end

patterns.each do |pattern|
  puts "  Pattern: #{pattern}"
  chars.each do |char|
    puts "    #{char}: #{!!char.match(pattern)}"
  end
end

# Output:
#
#  6.to_i = 6
#  ٦.to_i = 0
#  六.to_i = 0
#  ⠠.to_i = 0
#  Pattern: (?-mix:\d)
#    6: true
#    ٦: false
#    六: false
#    ⠠: false
#  Pattern: (?-mix:[[:digit:]])
#    6: true
#    ٦: false
#    六: false
#    ⠠: false
#  Pattern: (?-mix:[[:alnum:]])
#    6: true
#    ٦: false
#    六: false
#    ⠠: false