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ある文字列がマルチバイト文字を含んでいるか

Ruby

Last updated at 2012-12-26Posted at 2012-08-10

String#bytesでとりだして上位ビットが1であるかどうかを見る

# -*- coding:utf-8 -*-

def has_mb?(str)
  str.bytes do |b|
    return true if  (b & 0b10000000) != 0
  end
  false
end

p has_mb?("this is 日本語") # => true
p has_mb?("this isn't nihongo!") # => false

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