ruby - Ruby 在一个字符串中检索一组字符串

Question

我有以下问题。

phrase = "I love Chrome and firefox, but I don't like ie."

browsers = ["chrome", "firefox", "ie", "opera"]

def little_parser ( str )

  # what's the best way to retrieve all the browsers within phrase?

end

如果我们使用方法 little_parser(phrase)，它应该返回

["chrome", "firefox", "ie"]

如果这句话是：

 phrase_2 = "I don't use Opera"

如果我们运行 little_parser(phrase_2)，它应该只返回：

["opera"]

我该如何以最简单的方式做到这一点？

Answer 1

您可以遍历浏览器并用于str.include?挑选出字符串中的项目：

def little_parser(str)
  browsers = ["chrome", "firefox", "ie", "opera"]
  browsers.select { |browser| str.include?(browser) }
end

Answer 2

def little_parser(str)
  str.scan(/\w+/).map(&:downcase) & browsers
end

Answer 3

phrase = "I love Chrome and firefox, but I don't like ie."

browsers = ["chrome", "firefox", "ie", "opera"]
phrase.scan(/\w+/).select{|i| browsers.include? i.downcase }
#=> ["chrome", "firefox", "ie"]