regex_unicode_spaces.rb

space = " "
japanese_space = [0x3000].pack('U')

puts "---"
puts "Space and \\s          : #{!!space.match('\s')}"
puts "Japanese Space and \\s : #{!!japanese_space.match('\s')}"

puts "---"
puts "Space and [[:space:]]          : #{!!space.match('[[:space:]]')}"
puts "Japanese Space and [::space:]] : #{!!japanese_space.match('[[:space:]]')}"

puts "---"
puts "Space and [[:punct:]]          : #{!!space.match('[[:punct:]]')}"
puts "Japanese Space and [:punct:]] : #{!!japanese_space.match('[[:punct:]]')}"

# Output:
# ---
# Space and \s          : true
# Japanese Space and \s : false
# ---
# Space and [[:space:]]          : true
# Japanese Space and [::space:]] : false
# ---
# Space and [[:punct:]]          : false
# Japanese Space and [:punct:]] : false