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（短语），它应该返回

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

如果短语是：

 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使用str.include?来挑出字符串中的项目：

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"]

Ruby在字符串中检索一组字符串

3 个答案: